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Remember and comit to memory the two circle equations.
C = pi d = 2 pi r
&
A = pi r^(2)
Taking the first equation
C = pi d
d = 2.5
pi = 3.141592..... ~ 3.14
Hence
C = 3.14 * 2.5
C = 7.85 units.
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What is the circumference of a circle with a 25mm diameter?
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