Ladder

Ladder 8 m long is leaning against the wall. Its foot is 1 m away from the wall. At which height ladder touches the wall?

Correct answer:

d =  7.9 m

Step-by-step explanation:

$$\begin{gathered} x=8\text{ m } \\ y=1\text{ m } \\ d=\sqrt{x^2-y^2}=\sqrt{8^2-1^2}=3\sqrt{7}=7.9\text{ m} \end{gathered}$$

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