In Fig. 12.31, a square OABC is inscribed in a quadrant OPBQ. If OA = 20cm, find the area of the shaded region.(Use `pi=3.14`)

In fig., a square OABC is inscribed in a quadrant OPBQ. If OA = 20 cm, find the area of the shaded region.

In figure, OACB is a quadrant of a circle 3.5 cm. OD = 2 cm, find the area of shaded region.

A square of side 3 cm is inscribed in a circle. Find the area of the shaded portion.

Find the areas of the squares whose sides are: 14 cm

In Fig. 12.30 ,OACB is a quadrant of a circle with centre O and radius 3.5 cm. If OD = 2 cm, find the area of the (i) quadrant OACB, (ii) shaded region.

In figure, OACB is a quadrant of a circle 3.5 cm. OD = 2 cm, find the area of quadrant OACB,

Find the area of a circle of radius 30 cm (use pi = 3.14)

In Fig. 12.27, AB and CD are two diameters of a circle (with centre O) perpendicular to each other and OD is the diameter of the smaller circle. If OA = 7 cm, find the area of the shaded region.