If the area of a circle is 78.5 what is the diameter?

Answer 1

To find the diameter of a circle from its area, use the formula for the area: ( A = \pi r^2 ). Given that the area ( A = 78.5 ), we can solve for the radius ( r ): ( r = \sqrt{\frac{A}{\pi}} = \sqrt{\frac{78.5}{\pi}} \approx 5 ). The diameter ( d ) is twice the radius, so ( d = 2r \approx 10 ). Thus, the diameter of the circle is approximately 10 units.