Question 568172: the formula to fund the area of a circle is A = pi r squared, where A equals area and R is the length of the radius of a circle. If the area of a circle is 225 pi square feet find the length of the diameter of the circle.
Answer by mathsmiles(68)   (Show Source):
You can put this solution on YOUR website! Area of this circle is 225 pi sq ft.
The area of the circle is pi R^2. Therefore
225 = R^2
We need to find the square root of 225:
sqrt (225) = 15 ft
This tells us the radius. BUT, going back to the original problem, the question doesn't ask us for radius, it asks for diameter. Tricky, tricky, tricky :-)
The formula relating radius and diameter is:
D = 2R
D = 2(15)
D = 30 ft
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