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Find the circumference and area of a circle of radius 4.2 cm.
Given:
A circle of radius 4.2 cm.
To do:
We have to find the circumference and area of the circle.
Solution:
We know that,
Circumference of a circle of radius $r=2 \pi r$
Area of a circle of radius $r=\pi r^2$
Therefore,
Circumference of the given circle $=2 \times \frac{22}{7} \times 4.2$
$=26.4 \mathrm{~cm}$
Area of the given circle $=\frac{22}{7} \times(4.2)^{2} \mathrm{cm}^{2}$
$=\frac{22}{7} \times 4.2 \times 4.2 \mathrm{~cm}^{2}$
$=55.44 \mathrm{~cm}^{2}$
The circumference and area of the circle are $26.4\ cm$ and $55.44\ cm^2$.
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