Question

find the area of a circle of radius 7 cm​

Answer 1

$\pi r { }^{2}$
=3.14×7×7
=3.14×49
=153.86 cm°2

Answer 2

$area \: of \: circle \: = \pi {r}^{2}$
r =7 cm
$area = \: \ \frac{22}{7} \times {7}^{2}$
$area \: = \frac{22}{7} \times 7 \times 7$
$area \: = 22 \times 7$
$area \: = 154$