In a circle, a 90degree sector has area 100straight pi i n squared. What is the radius of the circle? The radius of the circle is in.

Question

1.30in

2.40in

3.10in

4.20in

Answer 1

Since this sector is 90°, the area is 400sq/in.

area=r^2pi; so r^2=area/pi

400/3.14=127.32√=11.28"

Answer 2

Use your formula for the area of a circle= pi r^2

so 100pi = pi r^2

r^2 = 100

r=10