Question

the radius of a circular ground is 56m.inside it, runs a road of width 7m all along its boundary. find the areaof this road.

Answer 1

radius with road=56+7=63
area without road = 56*22/7=8*22=176
area with road =63*22/7 =198
area of road =198-176=22

Answer 2

$\huge\red{Answer\: is}$

Radius of circular ground is 56m

Width of road inside is 7m

so Radius of inner circle = 56- 7 =49m

Hence
Area of Road = Area of outer circle - Area of inner circle
$= \pi(56) {}^{2} - \pi(49) {}^{2} \\ = \pi((56) {}^{2} - (49) {}^{2} ) \\ = \pi( 3136 - 2401) \\ = \frac{22}{7} \times 735 \\ = 2310m {}^{2}$
Hope it helps you