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Question

Find the area of a circle whose diameter is $$28\,cm$$


Solution

Given, Diameter of a circle $$= 28 \,cm$$
WKT, Radius of a circle $$r = \dfrac{d}{2} = \dfrac{28} {2} = 14 \,cm$$
Then,
Area of the circle $$= \pi r^2$$ sq units
$$= \dfrac{22} {7} \times 14 \times 14$$
$$= 22 \times 2 \times 14$$
$$= 616 \,cm^2$$

Mathematics

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