Question

If the area of the shaded region given in figure 2 is 39.47cm^2 , find the radius of the circle.

Answer 1

Hello

Here is your answer

Area of sector=39.47cm²

x°/360°xπxr²=39.47

90/360x22/7xr²=39.47

1/4x22/7xr²=39.47

r²=39.47x4x7/22

r²=1105.16/22

r²=50.2

r=√50.2

r=7

Radius of the circle=7cm

Hope it helps you...