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Click the link below for a video on the proper use of ladders.
Use the cosine ratio: 5.437846722 meters
Use Pythagoras' theorem: 152-92 = 144 and the square root of 144 is 12 Answer: 12 feet
You really should use your calculator for such simple questions instead of posting them on WA . It requires far fewer key depressions and you get your answer quicker. However, since you are obviously incapable of carrying out even such a simple task, and the answer is 740.
yes