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Q.

The radius of a circle is increased by 1 cm. Then the ratio of the new circumference to the new diameter is

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a

$π : 2$

b

$π : 3$

c

$π : 1$

d

$π : \frac{1}{2}$

answer is C.

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Detailed Solution

Given radius of a circle increased by 1 cm

New radius, $r = r + 1$

New circumference $= 2 π (r + 1)$

New diameter $= 2 (r + 1)$

Ratio $= 2 π (r + 1) : 2 (r + 1)$

$= π : 1$

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