# How do you find the area of a circle with radius 5 mm, rounded to the nearest tenth?

##### 1 Answer
Jul 31, 2015

=color(blue)(79 mm^2

#### Explanation:

The area of a circle is given by formula:
color(blue)(pir^2

$\pi$ has a constant value of $3.14$

And the radius of the circle is $5 m m$

The area $= \pi {r}^{2} = 3.14 \times {\left(5\right)}^{2} m {m}^{2}$

$= 3.14 \times \left(25\right)$

$= 78.5 m {m}^{2}$

approxcolor(blue)(79 mm^2