Question

If BC passes through centre of circle , the area of the shaded region in the figure is ?

Answer 1

first find area of hemisphere which is πr^2/2
subtract area of triangle from it
which is 1/2a^2
from the triangle radius is a/√2(using trigonometry)
or phythogaros theorem
therefore ans is
πa^2/4- 1/2 a2
forth option

Answer 2

answer is b a^2(π/2 - 1)