Should that be 1.5 meters above the floor??
I'm afraid you're right and i made a mistake, it must be 1.5 meters above the floor.Should that be 1.5 meters above the floor??
Please show what you have tried, as we request:
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It will also be helpful if you tell us what you have learned that might be applied to this problem, even if you don't see how. Context is very important. I'm guessing that the only measurements from the picture that will be useful are the angles, so I expect you to list some theorems concerning angles in a projection.