Circumference = pi*diameter where pi is a mathematical constant whose value is approx 3.1416
So, diameter = 4.1 cm means circumference = 12.88 cm
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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?
The formula to calculate the circumference of a circle is C = πd, where C is the circumference, π is approximately 3.14, and d is the diameter of the circle. If the diameter is 1 cm, then the circumference would be C = π(1) = 3.14 cm.
A circle with a diameter of 8 would have the circumference of 2.54. This is the measurement inside the circle.
The circumference of a circle is pi times the diameter, so it would be 12*pi or about 37.7.
When you double the diameter, the circumference is also doubled.