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Octagonal Faced Packaging Cover: Quick 3D Demo

This protective packaging corner-cover is made up of three 1/4-regular-octagonal pieces with (0,0,0) = center of each. Given that each side of the regular octagon = 6.4 cm, what are possible coordinate values (x,y,z) for its other 9 vertices?

Quick (Silent) Demo in GeoGebra 3D Calculator with Augmented Reality