# Interactive video lesson plan for: Circles Theorem | Perpendicular bisector of the common chord

#### Activity overview:

Circles Theorem | Perpendicular bisector of the common chord
http://www.learncbse.in/ncert-solutions-for-class-9-maths/
00:20 Construction to solve the Above Circle theorem
02:00 Apply S.S.S rule of Congruency
02:20 Apply CPCT (Corresponding Parts of Congruent Triangles)
03:23 Apply S.A.S rule of Congruency
03:36 Apply CPCT
04:10 Using Linear Pair

http://www.learncbse.in/ncert-solutions-for-class-9-maths/

In this video, students learn aplication of Circles theorems (Several Theorems) and sample problems relating circles and associated angles.
Circles theorem 1. A circle is the collection of all points in a plane, which are equidistant from a fixed point in the plane.
Circles theorem 2. Equal chords of a circle (or of congruent circles) subtend equal angles at the centre.
Circles theorem 3. If the angles subtended by two chords of a circle (or of congruent circles) at the centre(corresponding centres) are equal, the chords are equal.

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Reference book for the above video is
National Council of Educational Research and Training (NCERT) Book for Class 9 Subject: Maths
This Video is also refers as CBSE Class 9 mathts NCERT Solutions Chapter 10 Circles Ex 10.4

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