At what height does the top of the ladder touch the wall?

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In the picture you see a ladder with a length of 4 meters, placed against a wall. The ladder touches the box of 1 by 1 meter, which is standing against the wall.

At what height does the top of the ladder touch the wall?

If the canal is 10 m wide at the top and 6 m wide at bottom and the area of cross-section is 640 m^2. What is the length of canal is (The cross-section of a canal is a trapezium in shape)?

The angle of elevation of a ladder leaning against a wall is 60º and the foot of the ladder is 4.6 m away from the wall.
What is the length of the ladder ?