13. Recall that for the triangle ABC, the law of cosines states that 2-d+b-2ab cos C. In the triangle shown in the figure to the right, find the measure of angle R. Note. The figure is not drawn to scale. A) 60° B) 120° C) 145° D) 2 09 E) 90

13. Recall that for the triangle ABC, the law of cosines states that 2-d+b-2ab cos C. In the triangle shown in the figure to the right, find the measure of angle R. Note. The figure is not drawn to scale. A) 60° B) 120° C) 145° D) 2 09 E) 90

Elementary Geometry For College Students, 7e

7th Edition

ISBN:9781337614085

Author:Alexander, Daniel C.; Koeberlein, Geralyn M.

Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.

Chapter2: Parallel Lines

Section2.4: The Angles Of A Triangle

Problem 34E

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Question

13. Recall that for the triangle ABC, the law of cosines states that
2-d+b-2ab cos C.
In the triangle shown in the figure to the right,
find the measure of angle R. Note The figure is not drawn to scale.
A) 60°
B) 120°
C) 145°
D) 2 09
E) 90

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