1. It is an angle formed by two radii meeting the center of a circle. a. central angle c. inscribed angle b. intercepted angle d. circumscribed angle 2. The sum of the measures of the angles of a triangle inscribed in a circle is a. 45 b. 90 c. 180 d. 360 3. An inscribed angle of a circle that intercepts a semicircle is a. right b. obtuse c. complimentary supplementary d. 4. The opposite angles of a quadrilateral inscribed to a circle are a. right b. obtuse c. complimentary supplementary d. 5. An arc of a circle measures 60°. If the radius is 18 cm, what is the length of the arc? a. 18.8 b. 9.4cm c. 10cm d. 3.5cm​