Question

The area of a circle is 43.25cm2.
Find the length of the radius rounded to 2 DP.

Answer 1

3.71 cm

Explanation:

Hi there!

Area of a circle equation:
`A=\pi r^2` where r is the radius

Plug in the area 43.25 cm²

`43.25=\pi r^2`

Divide both sides by π to isolate r²

`(43.25)/(\pi) =(\pi r^2)/(\pi) \\(43.25)/(\pi)=r^2`

Take the square root of both sides to isolate r

`\sqrt{(43.25)/(\pi)} =r\\3.71=r`

Therefore, the length of the radius rounded to 2 decimal points is 3.71 cm.

I hope this helps!