# Interactive video lesson plan for: Circles | Terms and Definations

#### Activity overview:

Circles | Terms and Definations
http://www.learncbse.in/ncert-solutions-for-class-9-maths/

Circles Terms and Definations:
The following video defines the tangent of a circle.

00:01 Q1. How many tangents can a circle have ?
00:15:DEFINATION OF TANGENT TO A CIRCLE:
(i) The centre of a circle lies in of the circle. (exterior/ interior)
00:25 Regions of Circle.(Exterior region and Interior region).
00:45 (ii) A point, whose distance from the centre of a circle is greater than its radius lies in of the circle. (exterior/ interior)
01:45 (iii) The longest chord of a circle is a of the circle.
01:54 Defination Diameter of a circle.
02:35 (iv) An arc is a when its ends are the ends of a diameter.
02:55 Defination of Semi-circle.
03:12 (v) Segment of a circle is the region between an arc and of the circle.
03:26 (vi) A circle divides the plane, on which it lies, in parts.

03:54 Q2. Write True or False: Give reasons for your answers.
(i) Line segment joining the centre to any point on the circle is a radius of the circle.
04:26 (ii) A circle has only finite number of equal chords.
05:00 (iii) If a circle is divided into three equal arcs, each is a major arc.
05:06 Major Arc & Minor Arc
05:44 (iv) A chord of a circle, which is twice as long as its radius, is a diameter of the circle.
05:54 Defination of Chord , Diameter .
06:05 (v) Sector is the region between the chord and its corresponding arc.
06:14 Defination of Sector , Segment.
06:50 (vi) A circle is a plane figure.

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In this video, students learn the definitions of a circle, a radius, a chord, a diameter, a secant, a tangent, congruent circles, concentric circles, an inscribed circle, and a circumscribed circle. Students are then asked to identify or draw these figures in given problems.

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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 10.1

Tagged under: GyanPub,ncert solutions,Free Online Maths Class,Maths,Free ncert solutions,CBSE Class 9 mathts NCERT Solutions Chapter 10 Circles Ex 10.1,Terms Definations,Circles

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