Space Visualization Test on Pyramid Edges

When a pyramid is unfolded into a net, determining the way that the edges are connected requires some spatial thinking. The number in a triangle labels its thick edge. This Demonstration tests your space visualization by asking for the label of the thick edge marked by "?".


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Each edge is is associated with two faces. The edges are numbered and displayed by triangulating the faces and putting the edge numberings into the adjoining triangles.
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