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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Circumference of a circle = pi*diameter or 2*pi*radius
Circumference = pi*2.5 = 7.853981634 square units
Circumference = 25*pi =78.53981634 or about 78.5 mm
The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
If the diameter of a circle is 12 inches the circumference is: 37.7 inches (diameter x pi = circumference).
The circumference of any circle is (pi) x (the circle's diameter).
If a circle has a circumference of 6 inches the diameter is: 1.91 inches (circumference divided by Pi = diameter).