The radius of semi circle ARC is 7cm
The radius of semi circle APis3.5cm
The perimeter of curve is given as ARC+CQD+DSB+APB227×7+227×3.5+227×3.5+227×7227(21)=66cm
The area is given as ar(ARC)−ar(APB)+ar(BSD)−ar(CQD)227×72−227×3.52+227×72−227×3.52227×(49+49−12.25−12.25)=227×73.522×10.5=231cm2