Question

can anybody plzzz help me with this sum??​

Answer 1

Answer:

let diameter of bigger circle be x cm

therefore diameter for smaller circle x/2 cm

According to the question

21=x+x/2

lcm

21=3x/2

x=14cm

now radious of big circle =7cm

area =

22/7×7×7

22×7

154cm² -------------1

diameter of small circle = 7cm

radios=7/2cm

area=

22/7×7/2×7/2

22×7/4

77/2cm²--------------2

area of shaded region =1+2

154+77/2

192.5 cm²