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. If mWX = 24°, mXY = 67°, and mYZ = 100°, what is mZW?
