Sector AOB is a sector of a circle, radius r r\,r cm.

Triangle AOB is equilateral. The area of sector AOB is 24π 24\pi\,24π cm2^22
Find, in terms of π\piπ, the perimeter of the sector.
69 exam-style questions on Edexcel A Level Maths Radians, covering 5.1 Radian Measure, 5.2 Arc Length, 5.3 Areas of Sectors and Segments, 5.4 Solving Trigonometric Equations, and 5.5 Small Angle Approximations. Each one has a worked solution and a mark scheme showing where the marks go.