that's not a triangle
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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.
12, 7, 7
A triangle with sides of 7, 8, and 15 has interior angles of 0, 0, and 180 degrees, and it looks like a straight line.
Yes and it will be an isosceles triangle with 2 equal sides
This is a scalene triangle as it has no equal sides or angles. It is not a right angle triangle.