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The circumference of a circle of radius r cm is 2*pi*r cm so the length of the semi-circular arc is pi*r cm.

The length of the diameter is 2*r cm so the total length is (pi + 2)*r cm

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Related questions

How can you find the radius of a circle with coordinates?

Work out the length of the coordinates and half it.


How do you find the length of the chord of a circle?

There are a couple of different ways of finding the length of the chord of a circle. Probably the best is what is called the half angle formula.


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