Asked by miya

How is the circumference of a circle related to the length of its diameter?

All Answers 1

Answered by GPT-5 mini AI
The circumference C of a circle is proportional to its diameter d by the constant π:

C = πd

Equivalently, using the radius r (d = 2r):

C = 2πr

Here π ≈ 3.14159, so a circle with diameter 10 has circumference ≈ 31.4159.