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first you need to find what the circumference would be if it was a circle, so measure how much it is from the middle of the straight line of the semi-circle to the top of the arc. Double this number (so 5cm would become 10cm) then type into a calculator π then the number ( so in this case π x 10.) Then halve the answer. :)

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13y ago

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Q: How do you find arc length of semi circle?
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