An firefighter's extension ladder is leaning against a building, so its top just touches the gutters at the roof edge. You know the ladder is 41 feet long and it is 9 feet from the wall of the building. How high is the building?
The building is 40 ft.
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How many faces does a triangular prism have?
5
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15
How many vertices does an octahedron have?
6
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A piece of timber leaning against a wall, just touches the top of a fence, as shown. Find how far up the wall the timber reaches.