to find the circumference of any circle, times the diameter(d) by pi and you will get the answers.
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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
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?
circumference/pi = diameter