In a right-angled triangle the side opposite angle A is 3, the adjacent side is 4 and the hypotenuse is 5. What is cos A?
Answer and explanation
Correct answer: D. 4/5
- Step 1: cos A = adjacent/hypotenuse.
- Step 2: So cos A = 4/5.
Answer
4/5.
Why not the others: 3/5, 3/4 and 5/3 do not fit.
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