There is not enough information to figure out each side. They could be 3, 2, 1 or 2, 2, 2 2.5, 2.5, 1, etc. If the triangle is an equilateral triangle, then all sides would be equal thus each side would equal 2. If it isn't though, then you don't really know.
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a+b+c 2+2+2 or 6 inches total
It is: 3*9 = 27 inches
Each side is six inches long.
The perimeter of the equilateral triangle is 3 times 4 = 12 cm
That depends on the size of the angles which, in turn, determines the geometry of the triangle.