Jordan1977 Jordan1977

04-05-2018
Mathematics

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A circle has an area of 78.5 square inches. What is the diameter of the circle?

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perixwinkle perixwinkle

04-05-2018

We have to know the formula to finding the area of a circle. Since the area is clearly rounded, we can use 3.14 for pi.
R^2•3.14=78.5
Let’s divide both sides by 3.14.
R^2=25
5•5
5
So the radius is 5. The diameter is double the radius. The diameter of the circle is 10.

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