Question

find the area of a circle whose diameter is 4.2 meters

Answer 1

4.2/2=2.1m
AREA=
$\pi {r}^{2}$
= 22/7×2.1
=22×0.3
=6.6 sqm

Answer 2

area of circle=πr²
                    =22/7×2.1×2.1
                    =22×0.3×2.1
                    =13.86 m²