Question

What is the perimeter of a sector

Answer 1

perimeter of the sector is the sum of the lengths of all its boundaries.thus the perimeter of the sector is L+2r units. θ 360 × 2 π ( r ) + 2 r That would be the length of the arc in the first part and twice the radius in the second part.

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Answer 2

$2r + \frac{ \alpha }{360} \times 2\pi \: r$
(where alpha is the angle)

Here's the answer