you must multiply it by three
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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.
Measure it or use trigonometry if the 'included' angle is given.
Knowing only the angles of a triangle does not provide enough information to determine its perimeter. You must know the length of at least one side.
The isosceles triangle has a perimeter of: 14+14+9 = 37 feet
The perimeter would be 18 cm.