Applications-of-GeoGebra/C3/3D-Geometry/English

Visual Cue	Narration
Slide Number 1 Title Slide	Welcome to this tutorial on 3D Geometry.
Slide Number 2 Learning Objectives	In this tutorial, we will learn how to use GeoGebra to view: And construct different structures in 3D space Solids of rotation of polynomial functions Trigonometric functions in 3D space
Slide Number 3 System Requirement	Here I am using: Ubuntu Linux OS version 16.04 GeoGebra 5.0.481.0-d
Slide Number 4 Pre-requisites www.spoken-tutorial.org	To follow this tutorial, you should be familiar with: GeoGebra interface Geometry For relevant tutorials, please visit our website.
Slide Number 5 Rectangular Co-ordinate System [[Image:]]	This image shows the rectangular coordinate system. It is made up of mutually perpendicular axes and planes formed by them. The axes are x (in red), y (in green) and z (in blue). All points in 3D space are denoted by their x y z coordinates. The point of intersection of the three axes is the origin O 0 comma 0 comma 0. The gray rectangle in the image depicts the XY plane. The planes divide space into 8 octants. Point A is in the XOYZ octant and has the coordinates 4 comma 4 comma 2.
Show the GeoGebra window.	Let us draw a 3D pyramid in GeoGebra. I have already opened a new window in GeoGebra. This time, we work with Algebra, 2D Graphics and 3D Graphics views.
Under View, select 3D Graphics.	Under View, select 3D Graphics.
Click in 2D Graphics View to draw in 2D.	Click in 2D Graphics View to draw in 2D.
Drag the boundary to see 2D Graphics properly.	Drag the boundary to see 2D Graphics properly.
Click in 2D Graphics.	Click in 2D Graphics.
In 2D Graphics view, click on Polygon tool and click on origin (0,0). Point to A.	In 2D Graphics view, click on the Polygon tool and click on origin 0 comma 0. This creates point A at the origin.
Then click on (2,0) to create point B.	Then click on 2 comma 0 to create point B.
Click on (2,2) for point C, and on (0,2) to draw point D.	Click on 2 comma 2 for C and on 0 comma 2 to draw D.
Click again on point A.	Finally, click again on A.
Point to quadrilateral q1 in 2D and 3D Graphics views.	Note that a quadrilateral q1 is seen in 2D and 3D Graphics views. The length of each side is 2 units.
Click on Move tool.	Click on the Move tool.
Click in 2D Graphics and drag the background.	Click in 2D Graphics and drag the background.
Drag the boundary to see 3D Graphics properly.	Drag the boundary to see 3D Graphics properly.
Click in 3D Graphics and under Pyramid, on the Extrude to Pyramid or Cone tool. Click on the square in 3D Graphics view.	Click in 3D Graphics and under Pyramid, on the Extrude to Pyramid or Cone tool. In 3D Graphics view, click on the square.
An Altitude text box opens up, type 3 and click OK.	In the Altitude text-box that opens, type 3 and click OK.
Point to pyramid e in 3D Graphics view. Point to base. Point to E (1,1,3). Show altitude.	A pyramid e appears in 3D Graphics view. Its base is the quadrilateral q1. Its apex is E 1 comma 1 comma 3. Its altitude or height is 3 units.
Slide Number 6 Rotation of a Polynomial Let us rotate f(x)= ¬2x4-x3+3x2 Part in second quadrant (XY plane) about x-axis	Rotation of a Polynomial Let us rotate f of x equals minus 2 x raised to 4 minus x cubed plus 3 x squared. We will rotate the part that lies in the second quadrant, in XY plane, about the x-axis.
Show the GeoGebra window.	I have already opened a new window in GeoGebra. We will initially work with Algebra and 2D Graphics views and open 3D Graphics view later.
In input bar, type the following line and press Enter. f(x) = -2 x^4 -x^3+3 x^2	In the input bar, type the following line. To type the caret symbol, hold Shift key down and press 6. f x in parentheses equals minus 2 space x caret 4 minus x caret 3 plus 3 space x caret 2 Spaces here denote multiplication. Press Enter.
Under Perpendicular Line, click on Parallel line and on the y-axis.	Under Perpendicular Line, click on Parallel line and on the y-axis.
Keeping the cursor on the x-axis.	Keep the cursor on the x-axis.
Drag it along until you reach the intersection of f and x-axis. Point to the label function f, x-axis that appears.	Drag it along until you see function f, x-axis at the intersection of f and x-axis.
Click on this intersection point.	Click on this intersection point.
Point to A.	Point A appears.
Click on Slider and in Graphics view.	Click on Slider and in Graphics view.
A Slider dialog box opens.	A Slider dialog-box opens.
Leave a as the Name.	Leave a as the Name.
Change Min value to -1.5, Max value to 0 and Increment to 0.05.	Change Min value to minus 1.5, Max value to 0 and Increment to 0.05.
Click OK.	Click OK.
Point to slider a. Point to the part of function and x-axis in the second quadrant.	This creates slider a, which changes the value of a from -1.5 to 0. It will focus on the part of the graph in the second quadrant.
In the input bar, type (a,f(a)). Press Enter.	In the input bar, type the following in parentheses. a comma f a in parentheses. Press Enter.
Point to B.	This creates point B whose x coordinate is the value of a. Its y-coordinate lies along the curve described by the function f between x equals 1.5 and 0.
Right-click on slider a and check Animation On.	Right-click on slider a and check Animation On.
Point to B and slider a.	Point B travels along function f as a changes.
Right-click on slider a and uncheck Animation On.	Right-click on slider a and uncheck Animation On.
In the input bar, type (a,0) and press Enter.	In the input bar, type a comma 0 in parentheses and press Enter.
Point to C and slider a.	This creates point C. As its x co-ordinate a changes, C moves below point B along the x-axis.
Under Line, click on Segment and click on B and C to join them.	Under Line, click on Segment and click on B and C to join them.
Click on Move Graphics View and drag background to the left.	Click on Move Graphics View and drag the background to the left.
Click on View and check 3D Graphics to see the 3D Graphics view.	Click on View and check 3D Graphics to see the 3D Graphics view.
Point to 2D Graphics and 3D Graphics views.	Note that what is drawn in 2D Graphics appears in the XY plane, in 3D Graphics.
Click in 3D Graphics view and on Rotate 3D Graphics View. Rotate the 3D Graphics view to see the curve properly.	Click in 3D Graphics view and on Rotate 3D Graphics View. Rotate 3D Graphics to see the curve properly.
Place cursor on y-axis (in green). Click to see an arrow aligned with the y-axis.	Place the cursor on the y-axis (in green). Click to see an arrow aligned with the y-axis.
Then, drag along the y axis to see the curve properly.	Drag to pull the y-axis in or outwards to see the curve.
Type Circle[C,f(a),xAxis] in the input bar and press Enter.	In the input bar, type the following line Circle open square brackets capital C comma f a in parentheses comma x Axis with capital A. Close square brackets.
Point to circle c with center at point C.	This creates circle c with center at point C. Its radius is equal to f of a corresponding to the value of a on slider a. Its rotation is around the x-axis. Press Enter.
Right-click on circle c in Algebra view and check Trace On option.	In Algebra view, right-click on circle c and check Trace On option.
Right-click on slider a and select Animation On option.	Right-click on slider a and select Animation On option.
Point to the solid traced as a changes.	Observe the solid traced as a changes.
Point to 2D and 3D Graphics views.	Watch both 2D and 3D Graphics views.
Point to Segment BC, x-axis and function f.	Segment BC moves between the x-axis and function f.
Point to the part of f in the second quadrant.	The part of function f that is in the second quadrant in 2D, rotates around the x-axis.
Drag 3D Graphics to see it from another angle.	Drag 3D Graphics to see it from another angle.
Show the GeoGebra window.	Finally, let us look at trigonometric functions in 3D. I have already opened a new window in GeoGebra.
Click on 3D Graphics tool under View.	Under View, click on 3D Graphics.
Drag the boundary to see 2D Graphics properly.	Drag the boundary to see 2D Graphics properly.
Click in 2D Graphics, then on the Slider tool and in Graphics view.	Click in 2D Graphics, then on the Slider tool and in Graphics view.
Point to the slider dialog box and Number radio button selection. Type t in the Name field.	A slider dialog-box opens. By default, the Number radio-button is selected. In the Name field, type t.
Set Min to -6, Max to 16 and increment of 0.1. Click OK.	Set Min to minus 6, Max to 16 and increment of 0.1. Click OK.
Point to slider t.	This creates a slider t which will change t from minus 6 to 16.
In the input bar, type f(t)=cos(t) and press Enter.	In the input bar, type f t in parentheses equals cos t in parentheses and press Enter.
Click in 2D Graphics.	Click in 2D Graphics.
Under Move Graphics View, click on Zoom Out and click in 2D Graphics.	Under Move Graphics View, click on Zoom Out and click in 2D Graphics.
Click on Move Graphics View and drag the background.	Click on Move Graphics View and drag the background.
Point to the cosine function of f(t) in 2D and 3D Graphics views.	You can see the graph of the cosine function of f of t, in 2D and 3D Graphics views.
Similarly, type g(t)=sin(t) in the input bar and press Enter.	Similarly, in the input bar, type g t in parentheses equals sin t in parentheses. Press Enter.
Point to sine function graph (g(t)).	Sine function graph of g of t appears.
Now, type h(t)=t/4 in the input bar and press Enter.	In the input bar, type h t in parentheses equals t divided by 4 and press Enter.
Point to line (h(t)).	Line h of t is of the form y equals mx where slope m is 1 divided by 4.
Click in 3D Graphics view.	Click in 3D Graphics view.
Click on Point tool and click in the gray area in 3D Graphics view. Point to point A.	Click on the Point tool and click in the gray area in 3D Graphics view. This creates point A.
Drag the boundary to see its co-ordinates properly.	Drag the boundary to see its co-ordinates properly.
Double click on point A in Algebra view. Change the co-ordinates to (f(t),g(t),h(t)). Press Enter.	In Algebra view, double-click on A. Change the coordinates to the following.
Point to A.	The x- coordinate of A is cos t. The y-coordinate is sin t and t divided by 4 is its z coordinate.
Right-click on slider t and click on Object Properties.	Right-click on slider t and click on Object Properties.
A Preferences dialog-box opens. Click on Slider tab. Under Animation, for Repeat, choose option “Increasing” from dropdown menu.	A Preferences dialog-box opens. Click on Slider tab. Under Animation, for Repeat, choose option “Increasing” from the dropdown menu.
Close the Preferences dialog box.	Close the Preferences dialog box.
Right-click on point A in Algebra view and select Trace On.	In Algebra view, right-click on A and select Trace On.
Right-click on slider t and check Animation On.	Right-click on slider t and check Animation On.
Point to point A and the helix in 3D Graphics view. Point to point A’s co-ordinates in Algebra view.	Point A traces a helix in 3D space with coordinates mentioned earlier.
Click in Rotate 3D Graphic View and rotate the background. Rotate 3D Graphics view.	Click in Rotate 3D Graphic View and rotate the background. Rotate 3D Graphics view so you are looking down the z-axis at the XY plane.
Point to the traces of point A (cos(t), sin(t)).	Note that the traces of A are the circumference of a unit circle. Point A moves along the circle as angle t changes. In 2D, its coordinates are cos t comma sin t.
	Let us summarize.
Slide Number 6 Summary	In this tutorial, we have learnt how to use GeoGebra to view: And construct different structures in 3D space Solids of rotation of polynomial functions Trigonometric functions in 3D space
Slide Number 7 Assignment Construct a prism and a cylinder. Draw lines to pierce the structures and find their intersection points. Graph the polynomial, f(x)=x5-7x4+9x3+23x2-50x+24. Show the solid formed due to rotation of peak in first quadrant in XY plane.	As an assignment: Construct a prism and a cylinder anywhere in 3D space. Draw lines to pierce the structures and find their intersection points. Graph the given polynomial. Show the solid formed due to rotation of the peak, in the first quadrant, in the XY plane.
Slide Number 8 Assignment You tried to fly a kite off a cliff. The kite got dumped into the lake below You gave out 325 feet of string The angle of declination from where you stand at the cliff’s edge to the kite is 15 degrees How high is the cliff?	As another assignment, You tried to fly a kite off a cliff. The kite got dumped into the lake below. You gave out 325 feet of string. The angle of declination from where you stand at the cliff’s edge to the kite is 15 degrees. How high is the cliff?
Slide Number 8 About Spoken Tutorial Project	The video at the following link summarizes the Spoken Tutorial project. Please download and watch it.
Slide Number 9 Spoken Tutorial workshops	The Spoken Tutorial project team: <nowiki* conducts workshops using spoken tutorials and</nowiki> * gives certificates on passing online tests. For more details, please write to us.
Slide Number 10 Forum for specific questions: Do you have questions in THIS Spoken Tutorial? Please visit this site Choose the minute and second where you have the question Explain your question briefly Someone from our team will answer them	Please post your timed queries on this forum.
Slide Number 11 Acknowledgement	Spoken Tutorial project is funded by NMEICT, MHRD, Government of India. More information on this mission is available at this link.
	This is Vidhya Iyer from IIT Bombay, signing off. Thank you for joining.

Contributors and Content Editors

Madhurig, Snehalathak, Vidhya