How To Calculate The Radius Diameter And The Circumference Of A Circle To find the radius of a circle with a circumference of 10 centimeters, you have to do the following: divide the circumference by π, or 3.14 for an estimation. the result is the circle's diameter, 3.18 centimeters. divide the diameter by 2. and there you go, the radius of a circle with a circumference of 10 centimeters is 1.59 centimeters. The radius of a circle from the area: if you know the area a, the radius is r = √(a π). the radius of a circle from circumference: if you know the circumference c, the radius is r = c (2 × π). the radius of a circle from diameter: if you know the diameter d, the radius is r = d 2. fortunately, our radius of a circle calculator.
2 Formulas To Calculate The Circumference Of A Circle Wikihow The radius is just the line from the center of the circle. the diameter goes all the way through the center. the circumference is the area around the circle. you find the radius by taking the diameter and dividing it by 2. the diameter is found by multiplying the radius by 2. ex: the radius is 7.5. The radius, diameter, and circumference of a circle are all related through the mathematical constant π, or pi, which is the ratio of a circle's circumference to its diameter. the value of π is approximately 3.14159. π is an irrational number meaning that it cannot be expressed exactly as a fraction (though it is often approximated as ) and. You can calculate it as follows: if you know the radius or diameter of the circle, the area of the circle formula is: a = πr² = π × (d 2)². if radius and diameter are unknown, you can calculate it from the circumference: a = c² 4π. if you are interested in calculations of some fraction of a circle, check:. For example, the circumference of a circle with a radius of 4 inches is simply 2 x 3.14159 x 4 = 25.13 inches. if the diameter is given instead, first divide it by two, then repeat the above process. for example, if the diameter is 16 feet, then the radius is 16 2 = 8 feet. the circumference is therefore 2 x 3.14159 x 8 = 50.26 feet.
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