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51) Rewrite the formula for the circumference of a circle C=2 /pi "r" in terms of its diameter "d". Please show your working :)
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51) Rewrite the formula for the circumference of a circle C=2 /pi "r" in terms of its diameter "d". Please show your working :)

User Roger Trullo
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The circumference of a circle=2
\pir
We know that diameter is double the radius, and therefore can be written as d=2r
Circumference of a circle in terms of diameter is C=
\pid
The 2r cancels out
User NoDachi
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