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The area of a circle is 30.8m2. Find the length of the diameter rounded to 1 DP.
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10 votes
The area of a circle is 30.8m2.
Find the length of the diameter rounded to 1 DP.

User Danyelle
by
7.8k points

1 Answer

11 votes
Area of a circle = pi • r^2

We need to isolate for r.

A/pi = r^2

r = sqrt(A/pi)

r = sqrt(30.8/pi)

r = 3.1311251164

Diameter = 2r

Diameter = 6.26225023

Diameter = 6.3 m
User Achahbar
by
7.7k points
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