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Presumably 3-4 refers to where the triangle and square meet and 4-5 is square to pentagon?
Yes. Specifically, the angle between the plane of the triangle/square and the plane of the square/pentagon. These should fall out anyway if you make it from a net (like this one) but it may be tricky to add tabs in all the right places.
hamrack
@moocher
I want to make an Rhombicosidodecahedron, which is made up of triangles squares and pentagons.
The dihedral angles (according to wikipedia) are:
3-4: 159°05′41″ (159.09°)
4-5: 148°16′57″ (148.28°)
Presumably 3-4 refers to where the triangle and square meet and 4-5 is square to pentagon?