Question

The area of a circle is 65.71cm2.
Find the length of the radius rounded to 2 DP.

Answer 1

5 cm

Explanation:

Area of a circle:
`\pi r^(2)` {r=radius}

`\pi r^2=65.71cm2`

`r^2=65.71/3.14`
`(\pi =3.14)`

`r^2=20.92`

`r=√(20.92) =4.57cm`

`r=4.57=5cm`

`r=5cm`

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