18 inches and it is an equilateral triangle
Perimeter = 6 + 8 + 10 = 24 inches
To find the perimeter you just add up the sides. So it would be 24 inches.
Perimeter of triangle: 6+8+10 = 24 inches
perimeter = sum of sides = 6 in + 8 in + 10 in = 24 in
10+8+6 = 24 inches
a perimiter is always the distance all the way round. So it will be 6+ 8+10 but do it in stages 6+8=14 now add the last piece 14+10=24 (6+8+10=24) it does not matter if it is feet or miles or mm. Think of walking round the triangle. Hope that helps.
For the perimeter, add up all of the sides: 6+8+10= 24