Question

Find the area of the following circles, given that:

1. radius = 14 mm (Take $\pi$ = $\frac{22}{7}$ )
2. diameter = 49 m
3. radius = 5 cm

Answer 1

(a) $r=14\; mm$
Area = $\pi r^2$

$=\frac{22}{7}\times 14 \times 14$

= $616 \; mm^2$

---

(b) $d = 49 \; m$

$r=\frac{49}{2}\;m$

Area = $\pi r^2$

$= \frac{22}{7}\times \frac{49}{2} \times \frac{49}{2}$

= $1886.5\;m^2$

---

(c) $r= 5 cm$

Area = $\pi r^2$

$=\frac{22}{7}\times 5\times 5$

= $\frac{550}{7}$

= $78.57\;cm^2$