Question

If the radius of a circle is doubled, what happens to its:
(a) circumference?
(b) area?
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Answer 1

Answer:

$\huge\rm\purple{answer}$

Let consider r is the radius of a circle .

Here ,

• circumference = 2πr

• Area = πr²

If the radius r is doubled ,

• New radius = r × r = r²

• New circumference = 2πr²

• New Area = πr⁴

Hence it is clear that if the radius is doubled then the area and circumference too gets doubled .