Question

a circle with centre at O and angle aob is equal to 90 degrees if the radius of the circle is 40 centimetres calculate the area of the shaded portion of the circle take Pi 3.14​

Answer 1

So since there's an angle of 90°
Then the required area enclosed will be a quarter of area of the circle.


Using this relation we get

$\frac{1}{4} \times \pi ({40)}^{2} \\ \\ \frac{1}{4} \times 3.14 \times {(40)}^{2} = 1256 {m}^{2}$