Find the diameter of the circle if its area is 78.5 cm2.

univerkov | June 1, 2021 | education

The area of a circle has the formula S = P * R ^ 2. We substitute the data from the condition into the formula and we get: 78.5 = 3.14 * R ^ 2, we find R ^ 2 = 78.5 / 3.14 = 25. R = 5, because the root of 25 is also -5, but -5 is not suitable, because we are dealing with real values. D = R * 2 = 50 cm.Diameter = 50 cm.

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