4. Find cosC if a = 8, b = 7, C = 15. 102 с. 1 а. 112 112 d. -1 b. 144
Algebra & Trigonometry with Analytic Geometry
13th Edition
ISBN:9781133382119
Author:Swokowski
Publisher:Swokowski
Chapter8: Applications Of Trigonometry
Section8.2: The Law Of Cosines
Problem 3E
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Question
Transcribed Image Text:4. Find cosC if a = 8,
b = 7,
C = 15.
102
а.
с. 1
112
112
b.
d. -1
144
5. In a 30°-60°-90 triangle, the ratio of the hypotenusę to the side opposite the triangle, the ratio of the
hypotenuse to the side opposite the 30°angle is always equal to
V3
а.
с. 2
2
b. ;
d. V3
6. In a 45 °- 45°- 90°triangle, the ratio of the two legs is equal to
а.
1
c. -1
b. 0
d. undefined
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