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Read , learn and inwardly digest these two circle eq;n.s

C = 2 pi r or C = pi d

&

A = pi r^(2)

Very important when learning circular calculations.

Taking the first eq;n

C = 2 X pi X r

Where

C = circumference

2 is a constant

pi = 3.141592... ~=~ 3.14

r = radius.

NB The three terms on the RHS are MULTIPLIED TOGETHER>

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lenpollock

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6mo ago

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Circumference = (2) x (pi) x (radius)

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Wiki User

14y ago
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Q: What is the formula that relates circumference and radius?
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