Find the exact circumference of a circle with radius 7 m.
Hint
Look up the formula that relates circumference to radius.
Answer
14π m
Find the exact circumference of a circle with radius 89 cm.
178π cm
The circumference of a circle is 25π cm. What is its exact radius?
12.5 cm
The circumference of a circle is 185 cm. What is its exact radius?
92.5/π cm
Find the exact length of an arc with measure 10° and radius 3 km.
Look up the formula that relates arc length to arc measure and radius.
π/6 km
Find the length of an arc with measure 137° and radius 18 cm. Round your answer to two decimal places.
43.04 cm
Suppose an arc has length 17 m and measure 256°. What must its radius be? Round your answer to two decimal places.
3.80 m
Find the radius of an arc with length 35 km and measure 180°. Round your answer to two decimal places.
11.14 km
What is the exact length of a semicircle with radius 5 km?
Remember that a semicircle is an arc with length 180°.
5π km
In the figure below, points A, B, and C are on the circle. mABC = 135° and mBC = 103°. What is mAB?
Time to dust off the Arc Addition Postulate.
32°
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?
All arcs in a circle must add up to 360°, and we're lookin' for the arc of the unmarked part of the circle.
169°
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