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Circles

Circles

Example 1

In the figure below, A, B, and C are on ⊙O and m∠AOB = 38°. Is arc AB a major arc, a minor arc, or a semicircle?

Example 2

What is the circumference of a circle with radius 18 cm?

Example 3

What is the length of an arc with measure 78° and radius 5 m?

Example 4

What is the radius of an arc with measure 90° and length 31 cm?

Example 5

In the figure below, points A, B, and C are on ⊙O. m∠AOB = 80° and m∠BOC = 120°. What is the measure of arc AC?

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