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What is the angle between two edges of a cardboard box that meet in a corner?

Answer:

Angles in Three Dimensions

Box of Dynamite

Any two of the three edges of a corner of a cardboard box lie in a plane. The angle between them is 90°.

All the edges of the box intersect at right angles. When the edges are projected to form a 2D picture the angles between the edges are usually not 90°.

QUESTION 2:

If your viewpoint changes, do the angles between the edges of the box change?