Engineering Board Exam Reviewer · Solutions to Right Triangles · medium
A 13-m ladder stands with its foot 5 m from a wall. The foot is pulled 2 m farther from the wall. How far does the top of the ladder slide down the wall, in meters?
- 2
- 1.38
- 1.05
- 0.76
Answer
C. 1.05
Solution
Initially the top is at sqrt(132-52)=12 m. With the foot at 7 m, the top is at sqrt(132-72)=sqrt(120)=10.95 m. It slides 12-10.95=1.05 m.
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