Area and Perimeter Practice Test 4

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Question : 30 of 40

Marks: +1, -0

If the difference between the circumference and diameter of a circle is 30 cm, then the radius of the circle must be:

5 cm
6 cm
7 cm
8 cm

Solution:

Here, 2πr – 2r = 30 cm
⇒ 2r

({22}/7-1)

= 30
⇒ 2r × ×

{15}/7

= 30
∴ r =

{30×7}/{2×15}

= 7 cm

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