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Mathematics>Standard Multiple Choice

Read the following SAT test question and then click on a button to select your answer.

Note: Figure not drawn to scale. The sector of a circle shown has center at point O. The radius of the circle has length 1.4 and arc A C has length 2.1. Line segment O B is perpendicular to chord A C and bisects angle A O C. What is the length, l, of chord A C?

(A) 2.8 sin(0.75)
(B) 2.8 cos(0.75)
(C) 1.4 sin(1.5)
(D) 1.4 cos(1.5)

答案和解析

答案：A

解析：

Choice A is correct.