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Circumference of a Circle

Find the circ...

Question

Find the circumference of the semicircle whose diameter is $4 c m .$

A

3.46 c m

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B

5.89 c m

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C

6.28 c m

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D

10.28 c m

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Solution

The correct option is D $10.28 c m$
Diameter $= 2 \times$ radius
radius $= \frac{4}{2} = 2$ $c m$
Circumference of the semicircle $= π r + 2 r$
= $3.14 \times 2 + 4 = 10.28$ $c m$

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