Question

A circular park is surrounded by a road 21 m wide. If the radius of the park is 105 m. Find the area of the road.

Class:- X

Mathematics - NCERT Exemplar Problems

Areas related to Circles chapter

Answer 1

radius of the park=105m
radius of the road with park=105+21=126m
so, area of the road=π(126^2-105^2)
π(15876-11025)
= π(4851)
=22/7×4851
=22×693
=15246m^2.

Answer 2

Answer  

Radius of park =105 m

and road is 21m wide

thus, it forms an another circle of radius= 105 +21=126m

Therefore,

Area of road = Area of outer circle- Area of inner circle

=$\pi$r1^2 -$\pi$r2^2

=49896-34650

=15246 m^2

Step-by-step explanation: