If you know the diameter, multiply it by pi. If you know the radius, multiply it by 2xpi. Pi is approximately 3.1416.
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If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)
Diameter of a circle = circumference/pi
to find the circumference of any circle, times the diameter(d) by pi and you will get the answers.
Multiply the diameter by Pi (about 3.1416). The result is the circle's circumference.
In a circle, the circumference and diameter vary directly. Which of the following equations would allow you to find the diameter of a circle with a circumference of 154 if you know that in a second circle the diameter is 14 when the circumference is 44?