a ladder 20m long reaches a window of a building 15m. above the ground. find distance of the foot of the ladder from the building.
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Step-by-step explanation:
The ladder will form a right angled triangle with the wall with hypotenuse 17m and one side 15m. We have to find the third side
Use Pythagoras theorem
$$\begin{lgathered}17^{2}= 15^{2}+x^{
2} \\ x^{2} = 17^{2} - 15^{2} = 289-225 = 64 \\ x = \sqrt{64} = 8 m\end{lgathered}$$
2nd I'd in following
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