In the given figure, O is the centre of the circle with AC = 24 cm, AB = 7 cm and △ BOD = 90∘. Find the area of shaded region.
[Use π = 3.14]
In right triangle ABC
BC2=AB2+AC2=72+242=49+576=625∴,BC2=625⇒BC=25
Now,∠COD+∠BOD=180o ( Linear pair angles )
⇒∠COD=180o–90o=90o
Now, the area of the shaded region = Area of the sector having the central angle 360o–90o – Area of triangle ABC
=270o360o×π(BC2)2–12×AB×AC=34×3.14(252)2–12×7×24=367.97–84=283.97 cm2
Hence, the area of the shaded region is 283.97 cm2