Pi (symbolized by 
)
is the ratio of a circle's circumference to its diameter. The value
of 
is
approximately 3.14.
To find the circumference of a circle,
multiply its diameter by 
.
Since the diameter is twice the radius, the circumference equals
2
times the radius, or 2r.
In the figure above, W is the center of the circle, and
WX = 9. The circumference is 2r
or 2(9)
= 18.
Most questions will leave the
symbol in the answer choices. If
isn't in the answer choices, you can approximate it as 3, or 3.14
if you need more precision.
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