Question

Work out the perimeter of the sector.

311%
3
9 mm
Give your answer correct to 1 decimal place.
A
mm

Answer 1

66.9 mm

Explanation:

The perimeter of the sector is made up of 2 radii and the arc of circle with 311° and a radius of 9 mm.

perimeter = 2 × 9 mm + (311°)/(360°) × 2π(9 mm)

perimeter = 66.8517 mm

Answer: 66.9 mm