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Area of a Trapezium and a Polygon — MATHS STD 8 — Question

ICSE BoardEnglish MediumSTD 8MATHSArea of a Trapezium and a Polygon3 Marks
Question
The area of a circle is $1386 \ sq.cm$; find its circumference.
✓

Answer

Area of circle $=1386 \ cm ^2$
$\pi r^2=1386$
$ \frac{22}{7} r^2=1386$
$ r^2=1386 \times \frac{7}{22}$
$ r^2=441$
$ r=\sqrt{441}$
$r =21 \ cm$
circumference $=2 \pi r$
$=2 \times \frac{22}{7} \times 21$
$=132 m$

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