QuawesomeOnion
QuawesomeOnion QuawesomeOnion
  • 23-07-2018
  • Mathematics
contestada

What is the area of a circle if the circumference is 30cm (express your answer in centimetres)

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GoddessofDork
GoddessofDork GoddessofDork
  • 23-07-2018

So before we can find the area, we first have to find the radius. We will do this by using the circumference formula, C = 2πr, to find the radius. Our equation will look like this: 30 = 2πr .


For this, all you need to do is divide both sides by 2π, and your answer will be 4.77 cm = r.



Now that we got the radius, we can solve for the area, which is A = πr^2.


A = π(4.77)^2

A = 22.7529π cm^2 or 71.48 cm^2

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