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A 13 m ladder leans on a wall with its foot 5 m from the wall. Find the cosine of the angle at the ground.
A13/5
B5/12
C12/13
D5/13
Answer & Solution
Correct answer: D. 5/13
The foot distance 5 m is the adjacent side and the ladder 13 m is the hypotenuse, so cosine is 5/13.
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