The cube has 8 vertices. The number of ways to construct a triangle is (8 x 7 x 6) = 336 . read more
Because an equilateral triangle has three congruent sides, if the perimeter is 60 units, then each side is 20 units. Therefore, any triangle matching this description has three sides of length 20 units (and, of course, 20 is an integer). read more