Circle Calculator
https://www.calculatorsoup.com/calculators/geometry-plane/circle.php
WEBFeb 6, 2024 · Calculate A, r and d | Given C Given the circumference of a circle calculate the radius, area and diameter. Putting A, r and d in terms of C the equations are: \[r = \frac{C}{2 \pi} \] \[A = \pi r^2 = \pi \left(\frac{C}{2 \pi}\right)^2 = \frac{\pi C^2}{4 \pi^2} = \frac{C^2}{4 \pi} \] \[d = 2r = \frac{2C}{2 \pi} = \frac{C}{\pi} \]
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