Geometry and TrigonometryEasy–MediumCosine from side lengths
Geometry and Trigonometry practice question
In a right triangle, the leg adjacent to angle A has length 8, the leg opposite angle A has length 15, and the hypotenuse has length 17. What is cos A?
- A. 8/17Correct
- B. 15/17
- C. 8/15
- D. 15/8
Answer: A. 8/17
cos A = adjacent / hypotenuse = 8/17.
Why the other answers are wrong
- B. 15/17
- 15/17 is sin A.
- C. 8/15
- 8/15 is the reciprocal of tan A.
- D. 15/8
- 15/8 is tan A.
More Geometry and Trigonometry questions
- Easy–Medium
A circle has a radius of 6. What is its area? (Use A = πr².) - Easy–Medium
A right triangle has legs of length 6 and 8. What is the length of the hypotenuse? - Easy–Medium
A circle has a radius of 5. What is its circumference? (Use C = 2πr.) - Easy–Medium
What is the midpoint of the segment joining the points (2, 3) and (8, 11)? - Easy–Medium
What is the measure, in degrees, of angle B? - Easy–Medium
What is the area, in square centimeters, of the trapezoid?
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