Question

what is the perimeter of a circle having diameter 28cm?​

Answer 1

$\bigstar\huge\bf\underline{\underline{Given:-}}$

• diameter 28cm

$\bigstar\huge\bf\underline{\underline{To \ find:-}}$

• Perimeter of a circle

$\bigstar\huge\bf\underline{\underline{Answer:-}}$

We know that, Radius of the circle $\displaystyle{r = \frac{d}{2} = \frac{28}{2} = 14cm}$

Then,

Area of the circle = $\pi r^2$ sq units

$\implies\displaystyle{\frac{22}{7}\times 14\times 14}$

$\implies\displaystyle{22\times 2\times 14}$

$\implies\boxed{\boxed{\underline{\bf 616cm^2}}}$