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Find the area of the following circles, given that: $(Take\ \pi=\frac{22}{7})$
$(a)$ radius = 14 mm
$(b)$ diameter = 49 m
$(c)$ radius = 5 cm
$(a)$. Here, $r=14\ mm$
Area of the circle$=\pi r^2$
$=\pi\times14\times14$
$=\frac{22}{7}\times14\times14$
$=616\ mm^2$
$(b)$. Here, diameter$=49\ m$
$r=\frac{49}{2}\ m$
Area$=\pi r^2$
$=\frac{22}{7}\times\frac{49}{2}\times\frac{49}{2}$
$=\frac{3773}{2}\ m^2$
$=1886.5\ m^2$
$(c)$. Here, radius$=5\ cm$
Area$=\pi r^2$
$=\frac{22}{7}\times5\times5$
$=\frac{550}{7}\ m^2$
$=78.57\ cm^2$
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