Can someone explain to me the difference between the diameter, circumference, and the radius? What is the formula of finding the diameter, circumference or radius of a shape?

Question

kira_yamato · Answer

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diameter ø = 2 * radius = 2r
Circumference C = πø = 2πr

kira_yamato · Answer

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anonymous · Answer

Thank you!

kira_yamato · Answer

But note that the formula for circumference only applies for a circle.

hartnn · Answer

perimeter means sum of all sides of a figure (or length of boundary enclosing the figure)
for circle, perimeter = circumference = length of boundary enclosing circle.

anonymous · Answer

So then what are the formulas for like triangles?

hartnn · Answer

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