Question

Radius of a circle is 2πr cm. Its circumference is:
a)2πr
b)3πr
c)πr
d)4πr.​

Answer 1

Answer is :

Radius of circle is 2πr cm

So,the circumference must be

Circumference = Diameter

So,

2πr doubles to 4πr cm.

Answer is 4πr cm.

Answer 2

Answer:

radius = $2\pi r$

circumference = $2\pi r$

circumference = $2\pi \times 2\pi r$

circumference = $4\pi ^{2} r$

So, the circumference of the circle would be $4\pi ^{2} r$

hope it helps u

:)