the area of circle is 38.5cm2 find its circumference
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Step-by-step explanation:
area of square =π r²
38.5 =22/7 x r²
38.5 x 7
--------------- = r²
22
12.25. = r²
3.5 = r
circumference = 2 π r
= 2 x 22 /7 x 3.5
= 2 x 22 x 0.5
=44 x 0.5
= 22
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