Math, asked by phantomlegacy, 1 year ago

How perimeter of circle is 2πr derive with formulas only

Answers

Answered by shreya1432

Recall that the definition of pi (π) is the circumference c of any circle divided by its diameter d. Put as an equation, pi is defined as

π

=

c

d

Rearranging this to solve for c we get

c

=

π

d

The diameter of a circle is twice its radius, so substituting 2r for d

c

=

2

π

r

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