In the figure below, A and B are on ⊙O and m∠AOB = 38°. Is arc AB a major arc, a minor arc, or a semicircle?
What is the circumference of a circle with radius 18 cm?
What is the length of an arc with measure 78° and radius 5 m?
What is the radius of an arc with measure 90° and length 31 cm?
In the figure below, points A, B, and C are on ⊙O, m∠AOB = 80°, and m∠BOC = 120°. What's the measure of arc AC?