in given figure AD= 21 cm,AB=BC=CD=7 cm then area shaded region equal to
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AB=BC=CD=7 cm.
area of shaded region=area of semicircle of dia AC cm-area of semicircle of diameter AB+area of semicircle of dia BD-area of semicircle of dia CD
=\pi(7)^2-\pi(3.5)2+\pi(7)^2-\pi(3.5)
=2\pi(7)^2-2\pi(3.5)^2
=2\pi(7^2-3.5^2)
=2\pi[(7+3.5)(7-3.5)]
=2\pi(10.5×3.5)
=73.50π
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