Core Mathematics

1Find the area of a sector of angle 90° in a circle of radius 3.5 cm. (π = 22/7)

2A semicircle of radius 7 cm has an area of (π = 22/7)

3The area of a circle of radius 14 cm is 616 cm² (π = 22/7).

4The perimeter of a sector is

5Find the perimeter of a sector of angle 180° in a circle of radius 10.5 cm. (π = 22/7)

6The area of a circle of radius 35 cm is ___ cm². (π = 22/7)

7Find the area of a sector of angle 240° in a circle of radius 21 cm. (π = 22/7)

8Find the perimeter of a sector of angle 135° in a circle of radius 21 cm. (π = 22/7)

9Find the perimeter of a sector of angle 60° in a circle of radius 7 cm. (π = 22/7)

10The arc length of a semicircle is πr.