It depends on two things. First, one length, by itself, does not define a triangle. And second, it depends on what the question about the triangle is!
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It is an equilateral triangle
Use Pythagoras to find the perpendicular height of the triangle: 132-52 = 144 and the square root of this is the height of the triangle which is 12 cm Area = 1/2*12*10 = 60 square cm
Not too sure of the question but if one side is 8 cm then its height must be 3 cm because:- Area of the triangle is: 0.5*8*3 = 12 square cm
ABC is an equilateral triangle with side length equal to 50 cm. BH is perpendicular to AC. MN is parallel to AC. Find the area of triangle BMN if the length of MN is equal to 12 cm.
It is: 12 cm Check: 0.5*6*12 = 36 square cm