Question

[Maximum mark: 5] The diagram shows a sector AOB of a circle with centre O and radius r. The triangle AOB is equilateral and has perpendicular height 5 cm.

a) show that the radius of the sector is 10√3/3 cm.
b) find in terms of π, the perimeter P of the sector.

Answer 1

Explanation:

In (b) you may be more used to the formula for arc length:
`P=(\theta )/(180) * \pi r`.

The result is the same.