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Example 2. Look at the given circles and find the missing measure.

A H
3 cm

a. B O C b. E O ? F
?
8 cm

Solution. a. Radius (OA) = 3 cm

Diameter (BC) = 2 × OA = 2 × 3 cm = 6 cm
b. Radius (OH) = ?

Diameter (EF) = 8 cm The radius
is half the
2 × OH = 8 cm length of the
diameter.
OH = 8 cm ÷ 2 = 4 cm

Exercise 7E

1. look at the given circle. Name its following parts: E
a. Centre _________ b. Radius _________ G

c. Diameter _________ O

F
2. Which of the line segments shown 3. Which of the line segments shown
in this circle is its radius? in this circle is its diameter?
A C

O B A O B

C D P
4. draw circles of radius:

a. 5 cm b. 4 cm c. 6 cm d. 3 cm

5. find the radius of these objects.

a. b. c.

Diameter = 6 cm Diameter = 20 cm Diameter = 14 cm

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Geometry