The definition a triangle is that it has three sides and if it had any more or less it would become another shape. So, no.
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A triangle has 3 sides.
18 inches and it is an equilateral triangle
perimeter = sum of sides = 6 in + 8 in + 10 in = 24 in
For the perimeter, add up all of the sides: 6+8+10= 24
6+8+10=24 inches