A ladder of length 17 m leans against a vertical wall. The foot of the ladder is 8 m from the wall. How high up the wall does the ladder reach?

Answer and explanation

Correct answer: A.

  1. Step 1: Use Pythagoras: .
  2. Step 2: m.
Answer
.
Why not the others: : the two sides were added. : this is the square of the hypotenuse. : the sides were subtracted.

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