(b) In the figure (ii) given below, OAB is a quadrant of a circle. The radius
OA = 7 cm and OD = 4 cm. Calculate the area of the shaded portion.
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To find the area we have tu use this formula
Area = r × 1/4
= 7× 1/4
=7/4
1.75 cm ^2
Area of triangle = 1/2 × 7×4
=28/2
=14 cm ^2
Therefore area of the shaded part
Area of quadrant OAB - Area of triangle OAD
= 1.75-14
= 12.25 cm ^2
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