Question

find the area and circumference of a circle whose diameter is 9 CM​

Answer 1

Hey mate ☺

Diameter d = 9cm

Radius r = d÷2

$r = \frac{9}{2} cm$

Area of circle =

$\pi \: {r}^{2} \\ = \frac{22}{7} \times \frac{9}{2} \times \frac{9}{2} \\ = \frac{11 \times 81}{7 \times 2} \\ = \frac{891}{14} {cm}^{2}$

Circumference of circle =2πr
=2×22÷7×9÷2
=22×9/7
=198/7 cm

Hope it helps you☺✌✌