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OpenStudy (blockingthesky):
Find the angle between two faces of the pyramid represented by the points (0, 0, 0), (4, 0, 0), (0, 4, 0), (4, 4, 0), and (2, 2, 8). The square base does not count as a side. I did this earlier and got arccos(1/17), or about 86.6. Can anyone help verify?
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