APB & AQO are semicircles and AO = OB.if the perimeter of the figure is 40cm,find the area of the shaded region
we assume (π=22/7)
Let OA=OB=r
40=(π • r/2) + (π • r+r)
280=40r
r=7
shaded area=(1/2 • π • 7/2 • 7/2 + 1/2 • π • 7 • 7)cm²
(77 • 5/4)cm²
385/4 cm²