Ladder

8.3 meters long ladder is leaning against the wall of the well, and its lower end is 1.2 meters from this wall.

How high from the bottom of a well is the top edge of the ladder?

Correct result:

x =  8.21 m

Solution:

$$\begin{gathered} 8.3^2=x^2+1.2^2 \\ {x}^2=8.3^2-1.2^2=67.45 \\ x=\sqrt{67.45}=8.21\text{ m} \end{gathered}$$

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