Question

if radius is 5cm then whatis diameter and circumstance

Answer 1

r=5
d=2r=2*5=10
c=2πr
=2*22/7*5
=31.42

Answer 2

radius = 5cm , diameter = 5×2 =10
circumference
$2\pi \: {r}^{2}$
$= 2 \times 22 \div 7 \times 5 \times 5$
$= 157$