Question

A sector of a circle of radius r cm has an area of A cm 2 . Express the perimeter of the sector in terms of r and A.

Answer 1

   Answer:

         2A / r

Step-by-step explanation:

Area of sector = θ / 360 πr² = A

θ / 360 π = A / r²  ------ {i}

Perimeter of sector =  θ / 360 2πr ------ {ii}

from {i} and {ii}

Perimeter of sector =  A / r² × 2r

                                =  2A / r

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