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Question:

If the area of a circle is 38.5m2, then its circumference will be?

38.5

3.85

2.2

22

Solution:

Area of a circle=πr2∴38.5=πr2∴227×r2=38.5⇒r2=38.5×722⇒r2=12.25⇒r=√12.25∴r=3.5Now, Circumference of circle=2πr∴Circumference of circle=2×227×3510∴Circumference of circle=22m