Depends on the material
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Area of any circle = pi*radius squared
If one side of the triangle is 8cm then the other side is 7cm because 0.5*8*7 = 28 square cm
density = mass/volume = 50g/8cm^3 = 6.25 g/cm^3
That would depend on its radius which has not been given but the area of a circle is pi times radius squared
8cm is about 3 inches