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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