A dodecahedron (12 faces) and a icosahedron (20 faces) have 30 edges.

30 is the smallest integer with three different prime divisors, 2, 3 and 5.

The 5-12-13 Pythagorean triangle is one of two whose areas andperimeter are equal.

. Area = Perimeter = 30

Also true for the 6-8-10 triangle. Area = Perimeter = 24

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