# How to find the radius of a circle

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## Finding the Radius of a Circle Given the Diameter

If you know the diameter of a circle, you can find its radius by dividing the diameter by 2 2: r = d 2 r = d 2. This is the simplest formula you can use to get the radius. If you need to go from radius to diameter, multiply radius times 2 2:

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## How to Find Area from Diameter

From the above-mentioned formulae, it is possible to calculate the radius. r=C/2*π. Say, for example, you have a circle of circumference 28cm and

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Equation of a Circle With Examples

1. Write down the circumference formula. The formula is C=2πr{\displaystyle C2. Solve for r. Use algebra to change the circumference formula until r (radius3. Plug the cir See more

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## ACT Math : How to find the equation of a circle

Radius of Circle Equation. The radius of a circle equation on the cartesian plane with center (h, k) is given as (x − h) 2 + (y − k) 2 = r 2. Here, (x, y) are the points on the circumference of the circle that is at a distance ‘r’ (radius) from the center

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