A ladder 13 m long rests against a vertical wall. If the foot of the ladder is 12 m away from the wall and the ladder just reaches the top of the wall, how high is the wall?
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Answer:
5
Step-by-step explanation:
As you can see in the diagram the wall is at 90 degree angle from the ground(which will not be given in the exam or book. You have to assume that)
By applying Pythagoras theorem you can find the answer.
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