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Answered 2012-02-12 06:14:50
perimeter_of_quarter_circle = 1/2πr + 2r
For the arc bit of the perimeter:
circumference of circle = 2 x π x radius
quarter of this = 1/2 x π x radius
The two straight sides are radii which need to be added on making:
perimeter_of_quarter_circle = 1/2 x π x radius + 2 x radius
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