Question

The area of a circle is $154cm²$. Find its diameter.

Answer 1

Step 1:To calculate the radius of circle

Area of circle$=\mathrm{\pi }{\mathrm{r}}^2$

Radius of circle$=\sqrt{\frac{Areaofcircle}{\mathrm{\pi }}}$

Radius of circle$=\sqrt{\frac{154}{{\displaystyle \frac{22}{7}}}}=\sqrt{\frac{154\times 7}{22}}=7cm$

Step 2:To calculate the diameter of circle

Diameter$=2\times$radius

Diameter$=2\times 7=14cm$

Hence, diameter of circle is $14cm$.