Question

find the radius of a circle so that its area and circumference have the same value

Answer 1

$2 \pi r= \pi r^2$

$2r= r^2$

$r^2 - 2r= 0$

$r(r - 2) = 0$

$r = 0 \text { (rejected )} \ or \ r = 2$

Answer: radius = 2 units