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If a semi-circle has radius 4cm, work out the area of the semi-circle

The formula for the area of a circle is pir²,therefore for semi-circle, the formula becomes1/2pir²
Using our known values this is 1/2pi*16 (4²)Using a calculator this gives the value25.13 (2 d.p)

Answered by Ben S. • Maths tutor

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