Question

The area of a circle is 61. 27cm2. Find the length of the radius rounded to 2 DP

Answer 1

r = 4.45

Explanation:

The relationship between a radius and area of a circle is:

`A = \pi r^(2)`

To find the radius, we plug in the area and solve.

`61.27 = \pi r^(2)\\( 61.27)/(\pi) = r^(2)\\19.50 = r^2\\r = √(19.5) \\\\r = 4.41620275....\\r = 4.45`