Use the formula C = πd to find the circumference if you know the diameter. In this equation, "C" represents the circumference of the circle, and "d" represents its diameter. That is to say, you can find the circumference of a circle just by multiplying the diameter by pi.

https://www.wikihow.com/Calculate-the-Circumference-of-a-Circle

How to find the circumference of a circle: The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle. If a circle has a diameter of 4, its circumference is 3.14*4=12.56. If you know the radius, the diameter is twice as large.

https://en.m.wikipedia.org/wiki/Pi

How do you find the radius when you have the circumference? Divide the circumference by π, or 3.14 for an estimation. The result is the circle’s diameter. Divide the diameter by 2. There you go, you found the circle’s radius.

https://www.mvorganizing.org/how-do-you-find-the-radius-when-you-have-the-circumference/

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.

https://www.reference.com/world-view/formula-circumference-circle-7e508134800bdd34

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The circumference, C, of any circle be found using the equation C = π × d C = π d The symbol, π, is a Greek letter called “pi”. It represents the number 3.141592653589… * this is known as an …

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1. Measure & record the diameter and circumference of at least ten different circles TO THE NEAREST 10TH OF A CENTIMETER. 2. Now calculate circumference divided by diameter, and …

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AREA Formula CIRCUMFERENCE (Perimeter) Formula Circle A = r C = d or C = 2r POLYGON AREA Formula 1 AREA Formula 2 Square A = s A = ½ d Rhombus A = bh A = ½ dd Parallelogram A = …