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Q.3 If the circumference of a circular sheet is 154 m, find its radius. Also find the area of the sheet. (Take \(\pi =\frac{22}{7} \))
Answer :

Given: Circumference = 154 m
\(\therefore 2 \pi r = 154 \)
Or, \( 2 × \frac{22}{7} × r = 154 \)
Or, r = \(\frac{154×7}{2×22} = \frac{49}{2} m \)
\(\therefore \) area of circle =\( \pi r^2 = \frac{22}{7} × \frac{49}{2}×\frac{49}{2} \)
= \(\frac{3773}{2} m^2 = 1886.5 m^2 \)