If it is and equilateral triangle, the perimeter is 12, otherwise it is impossible to figure out without any angle measurements or other sides lengths
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The perimeter would be 18 cm.
Equilateral triangles have all sides the same length, and to get the perimeter, you add all the side lengths. 15+15+15=45
That depends on what type of triangle is if the side given is equal to the perimeter divided by 3 then it is an equilateral triangle.
Perimeter = 4*4.5 = 18 feet
The isosceles triangle has a perimeter of: 14+14+9 = 37 feet