Mathematics

The angle of a sector of a circle radius 10.5cm is 120°. Find the perimeter…

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