On taking AABC, use cosines law: 450 300 500 Om)* =(450 m)* +(500 m)* – 2×(450 m)(500 m ) cos A (90000) = (452500)-(450000)cos A %3D -(362500) =-(450000) cos A A=36.33°

Trigonometry (11th Edition)
11th Edition
ISBN:9780134217437
Author:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Chapter1: Trigonometric Functions
Section: Chapter Questions
Problem 1RE: 1. Give the measures of the complement and the supplement of an angle measuring 35°.
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On taking AABC, use cosines law:
450
300
500
(300 m)* =(450 m)* +(500 m)* – 2×(450 m ) (500 m ) cos A
(90000) = (452500)-(450000) cos A
-(362500) = -(450000) cos A
A=36.33°
Transcribed Image Text:On taking AABC, use cosines law: 450 300 500 (300 m)* =(450 m)* +(500 m)* – 2×(450 m ) (500 m ) cos A (90000) = (452500)-(450000) cos A -(362500) = -(450000) cos A A=36.33°
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