![]() ![]() Simply input the information you know and the rest will be computed for you nearly instantly. Of course, you don’t have to go through all the manual calculations to use this calculator. If you know the diameter, simply divide by 2 to get the radius and use the same formula as above. If rounding to the nearest tenth the area is 78.5 square inches. This is because the diameter is twice the length of the radius. If you wish to know the diameter from the area, follow the procedure above but double the result you get for r. Simply divide a by π to get r² and take the square root of If you know the diameter and not the radius, simply divide the diameter by 2 to get the radius and still use the formula above.Īgain, the formula can be used to solve for the radius, if you know the area. #math #mathhelp #mathematics #piday #pi #mometrix #area ♬ original sound – Mometrix Test Preparation help finding the area of a circle? We’ve got you covered! Link in bio. For example, if we know the circumference, but don’t know the radius, you can solve c = 2 πr for r and get \(r = \frac\). Suppose you only know the diameter? If the diameter is 8 cm, then the circumference is c = π(8) = 8 π or 25.1 cm, rounded to the nearest tenth.Ī great thing about the formulas is that you can manipulate it to solve for an unknown if you know one of the other quantities. If you prefer a numerical value, the answer rounded to the nearest tenth is 37.7 cm. If r = 6 cm, the the circumference is c = 2 π(6) = 12 π cm, if writing in terms of π. Let’s calculate one manually, for example. This depends on whether or not you know the radius ( r) or the diameter ( d) The animation shows the connection between radius and circumference: pi We mentioned that pi is a mathematical constant: a specific number with interesting. ![]() ![]() The circumference is similar to the perimeter in that it is the total length needed to draw the circle. The equations will be given below so you can see how the calculator obtains the values, but all you have to do is input the basic information. The circle calculator finds the area, radius, diameter and circumference of a circle labeled as a, r, d and c respectively.įor those having difficulty using formulas manually to find the area, circumference, radius and diameter of a circle, this circle calculator is just for you. How to Calculate Circumference, Diameter, Area, and Radius ![]()
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