Question

What the area of a circle with the diameter of 10 kilometers

Answer 1

Given:

Given that the diameter of the circle is 10 kilometers.

We need to determine the area of the circle.

Radius of the circle:

The radius of the circle can be determined using the formula,

$r=\frac{d}{2}$

Substituting d = 10, we get;

$r=\frac{10}{2}$

$r=5$

Thus, the radius of the circle is 5 kilometers.

Area of the circle:

The area of the circle can be determined using the formula,

$A=\pi r^2$

Substituting r = 5, we get;

$A=(3.14)(5)^2$

$A=(3.14)(25)$

$A=78.5$

Thus, the area of the circle is 78.5 square kilometers.