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Changing Scale (Including Flags)

what is the r...

Question

what is the ratio of the perimeter of half semi-circle to the circumference of the circle

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Solution

Let radius of the circle = r

circumference of circle = 2∏r
perimeter of the semi circle = ∏r
Perimeter of half semi circle = ∏r/2

Ratio = ∏r/2 : 2∏r=1/2 : 2 = 1:4

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Changing Scale (Including Flags)

Standard VII Mathematics

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