Homework Help is Here – Start Your Trial Now!
Math
Trigonometry
By postulate of alternate interior angles, the angle at the head of the first load on the opposite side with respect to the horizontal is also 60°. With a knowledge that the angle of a straight line is 180°, angle a can be determined. 20⁰ 60° 50N α R 70N a=180-60-20 = 100° By law of cosines: R²=50² +70²-2(50) (70) cos (100) R = 92.82N

By postulate of alternate interior angles, the angle at the head of the first load on the opposite side with respect to the horizontal is also 60°. With a knowledge that the angle of a straight line is 180°, angle a can be determined. 20⁰ 60° 50N α R 70N a=180-60-20 = 100° By law of cosines: R²=50² +70²-2(50) (70) cos (100) R = 92.82N

Trigonometry (11th Edition)
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°.
See similar textbooks
icon
Related questions
Question

Can anyone explain to me where did the " -2(.50)(70)cos100 " come from? I understand the Pythagorean theorem but if finding for R, I thought it would stop there. 

By postulate of alternate interior angles, the angle at the head of the first load on the opposite side with respect to the horizontal is also 60°. With a knowledge that the angle of a straight line is 180°, angle a can be determined. 20° 60° 50N α R 70N a=180-60-20 = 100° By law of cosines: R² = 50² + 70² − 2 (50)(70) cos (100) R = 92.82N
Transcribed Image Text:By postulate of alternate interior angles, the angle at the head of the first load on the opposite side with respect to the horizontal is also 60°. With a knowledge that the angle of a straight line is 180°, angle a can be determined. 20° 60° 50N α R 70N a=180-60-20 = 100° By law of cosines: R² = 50² + 70² − 2 (50)(70) cos (100) R = 92.82N
Expert Solution
steps

Step by step

Solved in 2 steps

SEE SOLUTIONCheck out a sample Q&A here
Blurred answer
Recommended textbooks for you
Trigonometry (11th Edition)
Trigonometry (11th Edition)
Trigonometry
ISBN:
9780134217437
Author:
Margaret L. Lial, John Hornsby, David I. Schneider, Callie Daniels
Publisher:
PEARSON
Trigonometry (MindTap Course List)
Trigonometry (MindTap Course List)
Trigonometry
ISBN:
9781305652224
Author:
Charles P. McKeague, Mark D. Turner
Publisher:
Cengage Learning
Algebra and Trigonometry
Algebra and Trigonometry
Trigonometry
ISBN:
9781938168376
Author:
Jay Abramson
Publisher:
OpenStax
Trigonometry (MindTap Course List)
Trigonometry (MindTap Course List)
Trigonometry
ISBN:
9781337278461
Author:
Ron Larson
Publisher:
Cengage Learning
SEE MORE TEXTBOOKS