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Area of a circle round to the nearest hundrendth

Mathematics
Tutor: None Selected Time limit: 0 Hours

4. circumference= 31.4

radius= do not know

area= do not know

Can anyone help me solve how to do this

Apr 14th, 2015

Circumference = 2pi(r)  where r = radius

2pi(r) = 31.4

r = 31.4/2pi = 5

Area = pi(r^2) = pi(5^2) = 25pi = 78.54


Apr 14th, 2015

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