18 inches and it is an equilateral triangle
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perimeter = sum of sides = 6 in + 8 in + 10 in = 24 in
The perimeter of a triangle is the sum of the lengths of its sides. In this case, the perimeter of the triangle with sides measuring 3 inches, 5 inches, and 7 inches is 3 + 5 + 7 = 15 inches.
For the perimeter, add up all of the sides: 6+8+10= 24
The sides of a triangle add up to the perimeter.
A perimeter of a triangle is the sum of all three lengths on the sides.