Question

the given figure shows a circle with centre at o and angle AOB=90.if the radius of the circle is 40 cm and pi=3.14; calculate the area of the unshaded portion of the circle

Answer 1

angle of the unshaded portion = 360 - 90 = 270
Radius of circle = 40 cm
area of unshaded portion = (270/360)×pi×r×r
=3.14×(3/4)×1600 = 3.14 × 1200 = 3768 Sq cm

Area of unshaded portion = 3768 Sq cm