Page 63 - Mathematics Class - IX

Viva-Voce

1. Define a circle. Is it a one-dimensional or two-dimensional figure?
Ans. A circle is a figure formed by joining all the points equidistant from a fixed point in a plane. It is a two-
dimensional figure.
2. Define an arc.
Ans. An arc is a part of circumference of a circle.

3. State any other property of a circle.
Ans. Angle in a semi-circle is a right angle.
4. How many circles can pass through three non-collinear points?
Ans. One circle only.
5. What is the relation between the radius and diameter of a circle?

1
Ans. Radius = × diameter.
2
6. How many angles can pass through three collinear points?
Ans. No

MCQs

1. The region between a chord and either of the arc is called
a) a sector b) a segment c) a semi-circle d) an arc
2. In figure, if POQ is diameter of a circle and RP and RQ are equal, then ∠RPQ is
a) 30° R

b) 90°
c) 60°
P Q
d) 45° O

3. A circle divides the plane in which it lies, including circle in

a) 3 parts b) 2 parts c) 4 parts d) 5 parts
4. Number of semi-circles in a circle are
a) 3 b) 2 c) 1 d) none of these
5. The degree measure of major arc is
a) 270° b) 360° c) less than 180° d) greater than 180°

Answers: 1. b) a segment 2. d) 45° 3. b) 2 parts

4. b) 2 5. d) greater than 180°

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