Page 163 - Math Skill - 5

Geometry 161

Exercise 12.5

R
1. In the given figure, name: P A
(a) Radii of the circle. (b) Chords of the circle.
(c) Diameters of the circle. B O Q
S T
2. Fill in the blanks.
(a) If P and Q are two points on a circle, then the line segment PQ is called a ________ of
the circle.
(b) A diameter is the ________ chord of the circle.

(c) The distance around a circle is called its ________.
(d) ________ of a circle is called a semi-circle.

3. With the help of a ruler and compass, construct a circle whose radius is:
(a) 3 cm (b) 7.2 cm (c) 6.5 cm (d) 5.7 cm
4. Find the diameter of the circle whose radius is:

(a) 4 cm (b) 5.3 cm (c) 2.7 cm (d) 8.3 cm
5. Find the radius of a circle whose diameter is:
(a) 7 cm (b) 6.8 cm (c) 10.4 cm (d) 12 cm

6. Draw a circle of radius 3.7 cm. Construct a chord, a diameter and a radius in it.

ASSESSMENT TIME

COMPETENCY BASED QUESTIONS

A. Multiple-Choice Questions

1. A line has

(a) fixed length (b) infinite length (c) no length

2. A ________ has a starting point and an end point.

(a) line segment (b) line (c) ray

3. A right angle measures ________.

(a) equal to 90° (b) less than 90° (c) greater than 90°

4. An angle whose measure is 40° is an

(a) obtuse angle (b) acute angle (c) reflex angle
5. A triangle whose all the three sides are equal is a/an

(a) equilateral triangle (b) scalene triangle (c) Isosceles triangle