The circumference of a circle is $31.4\ cm$. Find the radius and the area of the circle? $(Take\ \pi=3.14)$

AcademicMathematicsNCERTClass 7

Circumference of the circle$=31.4\ cm$

$2\pi r=31.4$

$r=\frac{31.4}{2\times3.14}=5\ cm$
Area of the circle$ = 7\pi r^2=3.14\times5\times5=78.5\ cm^2$

Hence, the required radius$=5\ cm$ and area$=78.5\ cm^2$
raja
Updated on 10-Oct-2022 13:36:03

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