Suppose there is a triangle with sides a, b, and c and angles A, B, and C. Using the known given information below and the law of cosines, what is the measure of angle A? Round your answer to the nearest whole number, if necessary. a = = 20 cm b 13 cm C = 139°

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
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Suppose there is a triangle with sides a, b, and c and angles A, B, and C. Using the known given
information below and the law of cosines, what is the measure of angle A? Round your answer to
the nearest whole number, if necessary.
a = 20 cm
b = 13 cm
C = 139°
acer
Transcribed Image Text:Suppose there is a triangle with sides a, b, and c and angles A, B, and C. Using the known given information below and the law of cosines, what is the measure of angle A? Round your answer to the nearest whole number, if necessary. a = 20 cm b = 13 cm C = 139° acer
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