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| Math Central | Quandaries & Queries |
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Question from Ray: How do you find the circumference or radius of an area presuming it is a circle. Or in other words how do you find the c or r given only the area is 50 sq metres |
Ray,
The area of a circle is given by area = π r2 where r is the radius and π is approximately 3.1416. Thus if the area is 50 sq metres then
50 = π r2
so
r = √(50/π) = 3.99 metres
Once you know the radius you can find the circumference from the expression
circumference = 2 π r.
Penny
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