Pi (symbolized by Π)
is the ratio of a circle's circumference to its diameter. The value
of Π is
approximately 3.14.
To find the circumference of a circle,
multiply its diameter by Π.
Since the diameter is twice the radius, the circumference equals
2Π times the radius, or 2Π r.
In the figure above, W is the center of the circle, and
WX = 9. The circumference is 2Π r
or 2Π(9)
= 18Π.
Most questions will leave the Π
symbol in the answer choices. If Π
isn't in the answer choices, you can approximate it as 3, or 3.14
if you need more precision.
Next to display next topic in the chapter.
Test Prep Lessons With Video Lessons and Explained MCQ
Large number of solved practice MCQ with explanations. Video Lessons and 10 Fully explained Grand/Full Tests.