Geogebra/C3/Tangents-to-a-circle/English-timed - Revision history

PoojaMoolya at 09:09, 28 October 2020

2020-10-28T09:09:42Z

2017-03-27T11:43:57Z

2016-10-26T12:40:19Z

2015-04-30T10:24:31Z

2015-04-30T07:13:30Z

2015-04-30T06:55:33Z

2015-04-18T07:39:05Z

2015-04-18T07:32:19Z

2015-02-24T06:04:13Z

2015-02-24T05:58:15Z

@@ Line 74: / Line 74: @@
 |-
 |01:52
-|A dialogue box opens. Let's type value '''3''' for radius, click '''OK'''.
+|A dialog box opens. Let's type value '''3''' for radius, click '''OK'''.
 |-

@@ Line 24: / Line 24: @@
 |-
 |00:41
-|We will use the following Geogebra tools:
+|We will use the following Geogebra tools: Tangents, Perpendicular Bisector
 Tangents
-Perpendicular Bisector
+Intersect two Objects, Compass, Polygon & Circle with Center and Radius.
 Intersect two Objects
 Compass
 Polygon &
 Circle with Center and Radius.
 |-
@@ Line 78: / Line 74: @@
 |-
 |01:52
-|A dialogue box opens.
+|A dialogue box opens. Let's type value '''3''' for radius, click '''OK'''.
-−
-|-
-|01:53
-|Let's type value '''3''' for radius, click '''OK'''.
 |-

@@ Line 25: / Line 25: @@
 |00:41
 |We will use the following Geogebra tools:
-    .Tangents
+Tangents
-    .Perpendicular Bisector
+Perpendicular Bisector
-    .Intersect two Objects
+Intersect two Objects
-    .Compass
+Compass
-    .Polygon &
+Polygon &
-    .Circle with Center and Radius.
+Circle with Center and Radius.
 |-
@@ Line 278: / Line 278: @@
 |-
 |08:57
-|* Two tangents drawn from an external point are equal
+|Two tangents drawn from an external point are equal
 |-
 |09:01
-|* Angle between a tangent and radius of a circle is 90^0.
+|Angle between a tangent and radius of a circle is 90^0.
 |-
 |09:07
-|* Angle between tangent and a chord is equal to inscribed angle subtended by the chord.
+|Angle between tangent and a chord is equal to inscribed angle subtended by the chord.
 |-

@@ Line 164: / Line 164: @@
 |-
 |04:34
-|'''∠ADB'''= '''∠BEA''', angle of the semicircle of circle '''D'''. Lets measure the '''Angle'''.
+|'''∠ADB'''= '''∠BEA''', angle of the semicircle of circle '''d'''. Let's measure the angle.
 |-
@@ Line 185: / Line 185: @@
 |05:33
 |Please notice that tangent is always at right angles to the radius of the circle where it touches.
+Let us move the point '''B''' & see how the tangents move along with point '''B'''.
-Let us move the point '''B''' & '''C''' how the tangents move along with point '''B'''.
 |-
@@ Line 203: / Line 202: @@
 |06:11
 |"Angle between tangent and chord at the point of tangency is same as an inscribed angle subtended by the same chord".
-Angle DFB between tangents & chord = inscribed angle FCB of the chord BF.
+Angle DFB between tangent & chord = inscribed angle FCB of the chord BF.
 |-
@@ Line 255: / Line 254: @@
 |-
 |07:53
-|'''∠DFB''' is angle between  tangent and chord to the circle '''c'''.
+|'''∠DFB''' is the angle between  tangent and chord to the circle '''c'''.
 |-
@@ Line 263: / Line 262: @@
 |-
 |08:14
-|Notice that  '''∠DFB''' = '''∠FCB'''. Let us move the point '''D''' & '''C''' that tangents and chords move along with point 'D'.
+|Notice that  '''∠DFB''' = '''∠FCB'''. Let us move the point '''D''' & see that tangents and chords move along with point 'D'.
 |-

@@ Line 98: / Line 98: @@
 |-
 |02:15
-|Select '''Segment between Two Points''' tool. Join points '''A''' and '''B'''. A Segment '''AB''' is drawn.
+|Select '''Segment between Two Points''' tool. Join points '''A''' and '''B'''. A segment '''AB''' is drawn.
 |-
@@ Line 106: / Line 106: @@
 |-
 |02:37
-|Segment '''AB''' and perpendicular bisector intersect at a point. Click on '''Intersect two Objects''' tool.
+|Segment '''AB''' and perpendicular bisector intersect at a point. Click on '''Intersect Two Objects''' tool.
 |-
 |02:44
-|Mark point of intersection as '''C'''. Let's move point '''B'''& '''C''' how the perpendicular bisector and point '''C''' move along with point '''B'''.
+|Mark point of intersection as '''C'''. Let's move point '''B''' & see how the perpendicular bisector and point '''C''' move along with point '''B'''.
 |-

@@ Line 271: / Line 271: @@
 |-
 |08:36
-|I will type the file name as '''Tangent-angle'''. Click on '''Save'''. With this we come to the end of this tutorial.
+|I will type the file name as '''Tangent-angle'''. Click on '''Save'''. With this, we come to the end of this tutorial.
 |-
@@ Line 315: / Line 315: @@
 |-
 |09:55
-|Does the line-segment bisect the angle at the centre? Hint - Use Angle Bisector tool.
+|Does the line-segment bisect the angle at the centre? Hint - Use '''Angle Bisector''' tool.
 |-
 |10:05
-|The output  should look like this.
+|The output should look like this.
 |-

@@ Line 90: / Line 90: @@
 |-
 |02:04
-|Let's '''Move''' the point '''A''' & see that circle has same radius.
+|Let's move the point '''A''' & see that circle has same radius.
 |-
@@ Line 203: / Line 203: @@
 |06:11
 |"Angle between tangent and chord at the point of tangency is same as an inscribed angle subtended by the same chord".
- Angle DFB between tangents & chord = inscribed angle FCB of the chord BF.
+Angle DFB between tangents & chord = inscribed angle FCB of the chord BF.
 |-
@@ Line 311: / Line 311: @@
 |-
 |09:49
-|What is the sum of about two angles? Join centre and external point.
+|What is the sum of above two angles? Join centre and external point.
 |-

@@ Line 295: / Line 295: @@
 |-
 |09:17
-|"Angle between tangents drawn to an circle, is supplementary to the angle subtended by the line segments joining the points of contact at the centre".
+|"Angle between tangents drawn to a circle, is supplementary to the angle subtended by the line segments joining the points of contact at the centre".
 |-
@@ Line 323: / Line 323: @@
 |-
 |10:08
-|Sum of the angles is 180^0. The line segments bisects the angle.
+|Sum of the angles is 180^0. The line segment bisects the angle.
 |-
@@ Line 355: / Line 355: @@
 |-
 |10:54
-|More information on this mission is available at this link http://spoken-tutorial.org/NMEICT-Intro ]
+|More information on this mission is available at this link [http://spoken-tutorial.org/NMEICT-Intro].
 |-

@@ Line 46: / Line 46: @@
 |-
 |01:16
-|Tangent is a line that touches a circle at only one point.
+|"Tangent is a line that touches a circle at only one point".
 |-
 |01:22
-|The point of contact is called '''point of tangency'''.
+|The point of contact is called "point of tangency".
 |-
@@ Line 127: / Line 127: @@
 |03:30
 |Two circles intersect at two points.
 |-
@@ Line 203: / Line 202: @@
 |-
 |06:11
-|'''Angle between tangent and chord at the point of tangency is same as an inscribed angle subtended by the same chord'''.
+|"Angle between tangent and chord at the point of tangency is same as an inscribed angle subtended by the same chord".
   Angle DFB between tangents & chord = inscribed angle FCB of the chord BF.
@@ Line 280: / Line 279: @@
 |-
 |08:57
-| * Two tangents drawn from an external point are equal
+|* Two tangents drawn from an external point are equal
 |-
@@ Line 296: / Line 295: @@
 |-
 |09:17
-|Angle between tangents drawn to an circle, is supplementary to the angle subtended by the line-segment joining the points of contact at the centre.
+|"Angle between tangents drawn to an circle, is supplementary to the angle subtended by the line segments joining the points of contact at the centre".
 |-