Geometry and TrigonometryHardAdjacent leg from a cosine
Geometry and Trigonometry practice question
In a right triangle, cos A = 0.6, where A is an acute angle, and the hypotenuse has length 20. What is the length of the leg adjacent to angle A?
Answer: 12
cos A = adjacent/hypotenuse, so adjacent = 0.6 × 20 = 12.
Common wrong answers
- If you answered 16
- 16 is the opposite leg.
- If you answered 33.33
- 33.33 divides 20 by 0.6.
- If you answered 0.03
- 0.03 divides 0.6 by 20.
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