Prove that circumference of a circle is 2πr.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
Problem 1CT
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Prove that circumference of a circle is 2πr.
Please try to give a mathematical proof

Remember:
⇒ Should be explained properly.
⇒ Mention formulas if you used any.
⇒ Give reasons if required.

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