Question

in the circumference and the area of a circle are numerically equal then the diameter is equal to? I need solution. Answer is 4

Answer 1

circumference of circle=
$2\pi \: r$
area of circle=
$\pi \: r {}^{2}$
see the above pic for further solution
hope this helps you

Answer 2

Hlo friend.. Cutiepie Here..

Here is ur answer :

Circumference of circle =
$2\pi r$

Area of circle =
$\pi {r}^{2}$

According to question,

Circumference of circle = Area of circle


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

${both \ \: sides \: \: \pi \: \: cancel \: \: out}$

$2r = {r}^{2}$

$2 = r$


Radius r of cirle = 2


Diameter d of circle = 2r

= 2 × 2

= 4.


HOPE IT HELPS YOU..