Question

find the area of a circle whose diameter is 7 km​

Answer 1

r =7/2 cm

Area of circle =

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

= 22/7 * 7/2*7/2

=77/2 cm ^2

Answer 2

Answer:

radius of circle =diameter/2

=7/2

=3.5km

area of circle = πr2

=22÷7×3.5×3.5

=11×3.5

=38.5km2