Question

find the area of circle whose diameter is 7cm

Answer 1

The answer is given below

Answer 2

The area of circle is $\dfrac{77}{2} cm^{2}$ or $38.5cm^{2}$.

Step-by-step explanation:

Given,

The diameter of circle(d) = 7 cm

To find,  the area of circle = ?

∴ The radius of circle(r) = $\dfrac{7}{2}$ cm

We know that,

The area of circle $=\pi r^{2}$

$=\dfrac{22}{7} \times (\dfrac{7}{2})^{2}cm^{2}$

$=\dfrac{22}{7} \times \dfrac{7}{2} \times \dfrac{7}{2}$

$=\dfrac{11}{1} \times \dfrac{7}{2}$

= $\dfrac{77}{2} cm^{2}$ or 38.5 $cm^{2}$

Hence, the area of circle is $\dfrac{77}{2} cm^{2}$ or $38.5cm^{2}$.