Lesson: Geometry Intermediate - 16

Finding A Circumference

[Page 16 of 24]

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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