Geometry and TrigonometryEasyCosine as a ratio of sides
Geometry and Trigonometry practice question
A right triangle has legs of length 6 and 8 and a hypotenuse of length 10. What is the cosine of the angle between the leg of length 8 and the hypotenuse?
- A. 4/5Correct
- B. 3/5
- C. 4/3
- D. 5/4
Answer: A. 4/5
Cosine is adjacent over hypotenuse: 8/10 = 4/5.
Why the other answers are wrong
- B. 3/5
- 3/5 is the sine of that angle (6/10).
- C. 4/3
- 4/3 is 8/6, adjacent over opposite.
- D. 5/4
- 5/4 inverts the ratio.
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