A Million Years Ago An Alien Species Built A Vertical Tower On A Horizontal Plan

A million years ago, an alien species built a vertical tower on a horizontal plane. when they returned they discovered that the ground had tilted so that measurements of 3 points on the ground gave coordinates of (0, 0, 0), (2, 2, 0), and (0, 2, 2). by what angle does the tower now deviate from the vertical?

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