Point O is the center of a circle. The measure of arc RS on this circle is 100°. What is the measure, in ROS degrees, of its associated angle?
Correct answer: 100 (parsed from the explanation — this source omits an answer key for this item)
Explanation
The correct answer is 100. It’s given that point O is the center of a circle and the o measure of arc RS on the circle is 100 . It follows that points R and S lie on the circle. Therefore, OR and OS are radii of the circle. A central angle is an angle 39 SAT PRACTICE TEST #4 ANSWER EXPLANATIONS SAT ANSWER EXPLANATIONS n MATH: MODULE 1 formed by two radii of a circle, with its vertex at the center of the circle. Therefore, ∠ ROS is a central angle. Because the degree measure of an arc is equal to the measure of its associated central angle, it follows that the measure, in degrees, of ∠ ROS is 100.
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