Divide pie(3.14) from your circumference.
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Diameter of a circle = circumference/pi
circumference/pi = diameter
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?
Multiply the diameter by Pi (about 3.1416). The result is the circle's circumference.
If you have only the diameter to get the circumference you have to multiply the circumference by pi: 3.14