Question

in the fig given the boundary of shaded region diagram consist of 4 semi circle arc, the smaller two being equal ...if the diameter of largest is 14 cm & of smaller is 3.5 cm,calculate the area of shaded region

Answer 1

Area of shaded region =area of larger semicircle +area of other semicircle -2*area of semicircle (area of one circle).
=πRsq/2 +πR'sq/2 -πrsq
=22/7*7*7/2. + 22/7*3.5/2*3.5/2 *1/2- 22/7*10.5*10.5/2
=77 + 77/16 - 346.5/2cmsq
=77 + 4.81 - 173.2csq.
=91.35cmsq answer...