5*3 - 3*4 = 15 - 12 = 3
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All triangles have exactly 3 vertices
There are a number of properties of two similar triangles. This includes having same vertices, they also have the same angles and so much more.
how many more vertices does a square pyramid have that triangular pyramid
11 vertices (one more than the number of vertices in the base).
A decagon can have eight or more triangles - up to infinitely many.