# Calculate the area of circle having diameter as 10 cm?

Feb 19, 2018

$\text{Area} = 25 \pi c {m}^{2} \approx 78.5 c {m}^{2}$

#### Explanation:

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

$r = \frac{d}{2} = \frac{10}{2} = 5 c m$

$\text{Area} = \pi \cdot {5}^{2} = 25 \pi c {m}^{2} \approx 78.5 c {m}^{2}$

Feb 19, 2018

See below...

#### Explanation:

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

Where $r$ is the radius.

The radius is half of the diameter.

$\therefore r = \frac{10}{2} = 5 c m$

Area = $\pi \cdot {5}^{2} = 25 \pi c {m}^{2}$

I'd just leave the answer as an exact value unless specified in the question to a certain accuracy.

Feb 19, 2018

$\text{area "=25pi~~78.54" square cm}$

#### Explanation:

$\text{the area of a circle is calculated using}$

• " area of circle "=pir^2

$\text{where r is the radius of the circle}$

$\text{here } d = 10 \Rightarrow r = \frac{10}{2} = 5$

$\Rightarrow \text{area "=pixx5^2=25pi~~78.54" square cm}$