A ladder 6.5 m long leans against a vertical wall with its foot 2.5 m from the wall. How high up the wall does it reach?
Answer and explanation
Correct answer: D. 6 m
- Step 1: The ladder is the hypotenuse: .
- Step 2: , so m.
Answer
6 m.
Why not the others: 7 m: the squares were added instead of subtracted, giving 6.96 m. 9 m: the lengths were added rather than using Pythagoras. 4 m: the base was subtracted from the ladder length.
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