PSAT Math Multiple-Choice Question 595: Answer and Explanation

Question: 595

If a circle has a radius of 3 units, what is the length in units of the arc on the circle that measures radians

• A. π
• B.
• C.
• D. 7π

Correct Answer: B

Explanation:

(B) A measure of radians corresponds to of the distance around the circle since 2π radians is the entire distance around the circle. First find the circumference of a circle with radius of 3:

2πr = 2π3 = 6π

Then calculate of the circumference: