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Circles

Circles

Example 1

Find the exact circumference of a circle with radius 7 m.

Example 2

Find the exact circumference of a circle with radius 89 cm.

Example 3

The circumference of a circle is 25π cm. What is its exact radius?

Example 4

The circumference of a circle is 185 cm. What is its exact radius?

Example 5

Find the exact length of an arc with measure 10° and radius 3 km.

Example 6

Find the length of an arc with measure 137° and radius 18 cm. Round your answer to two decimal places.

Example 7

Suppose an arc has length 17 m and measure 256°. What must its radius be? Round your answer to two decimal places.

Example 8

Find the radius of an arc with length 35 km and measure 180°. Round your answer to two decimal places.

Example 9

What is the exact length of a semicircle with radius 5 km?

Example 10

In the figure below, points A, B, and C are on the circle. mABC = 135° and mBC = 103°. What is mAB?

Example 11

In the figure below, points W, X, Y, and Z are on the circle. mWX = 24°, mXY = 67°, and mYZ = 100°. What is mZW?

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