You will find the area of one triangle face and multiply that by two . use the formula: [tex]A = \frac{1}{2}bh[/tex] . Once you have done that, find the permimeter of the same triangular face by adding the lengths of each side and multiplying by the length 1.2. The perimeter should equal 3.2 for one triangular face (There are multiple ways to do this problem)
