In the given figure, ABCD is a rectangle inscribed in a circle. If two adjacent sides of the rectangle be 8 cm and 6 cm, calculate :

(i) the radius of the circle; and

(ii) the area of the shaded region.

Calculate the area of the shaded region, if the diameter of the semi-circle is 14 cm.

In an equilateral △ABC of side 14 cm, side BC is the diameter of a semi-circle as shown in the figure. Find the area of the shaded region.

In the given figure, AB is the diameter of a circle with centre O and OA = 7 cm. Find the area of the shaded region.