Find the length of a radius

Calculate the circle length with this fantastic tool, and know its circumference, radius, or diameter.Divide both sides by ?, then multiply both sides by 2. r2 = 36. Take the square root. r = 6. The radius of the circle is 6, and therefore the. How to Find Arc Length With the Radius and Central Angle? The arc length of a circle can be calculated with the radius and central angle using the arc length. How to find the length of an arc and sector area: an example — How to find the length of an arc and sector area: an example. Decide on the radius of your. Where C equals circumference the length of the circle’s perimeter r=C/(2pi) or r=C/6.28 for a close approximation. Practically speaking, circumference can be.