The radii of some circles are given below. What are their diameters?

(1) 7 cm
(2) 5 cm
(3) 2 m
(4) 2.5 cm

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Solution

The diameter of a circle = 2 × radius
(1) The radius = 7 cm
So, the diameter = 2 × 7 cm = 14 cm

(2) The radius = 5 cm
So, the diameter = 2 × 5 cm = 10 cm

(3) The radius = 2 m
So, the diameter = 2 × 2 m = 4 m

(4) The radius = 2.5 cm
So, the diameter = 2 × 2.5 cm= 5 cm

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The diameters of circles are given below. Find their radii.

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Using ruler and compass draw circles with the radii given below.

Mark their centres and draw the radii.

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