The angle of a sector of a circle radius 10.5cm is 120°. Find the perimeter of the sector [Take π = 22/7]
-
A.
22cm -
B.
33.5cm -
C.
43cm -
D.
66cm -
E.
115.5cm
Correct Answer: Option C
Explanation
Perimeter of a sector = (2r + frac{theta}{360} times 2pi r)
= (2(10.5) + frac{120}{360} times 2 times frac{22}{7} times 10.5)
= (21 + 22)
= 43 cm