Yes, but the proper preposition is in, not with.
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18 inches and it is an equilateral triangle
The perimeter of a shape is equal to the sum of the lengths of its sides. In this case, the perimeter is 6 + 8 + 10 = 24 inches.
4 sides x 15 in./side = 60 inches.
perimeter = sum of sides = 6 in + 8 in + 10 in = 24 in
If the perimeter is already measured in inches, there is nothing to convert. There are 18 inches in a perimeter of 18 inches.