The answer will depend on what measurements the three numbers represent. And since you have not bothered to share that crucial bit of information, I cannot provide a more useful answer.
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The area of the trapezoid is: 0.5*(6+2)*4 = 16 square cm
Area = 1/2*(6+4)*height
Area = 1/2 (sum of bases) times height Area = (8+12)/2 x 4 Area = 10 x 4 = 40
Area of a trapezoid in square units = 0.5*(sum of parallel sides)*height
area = 1/2 sum_of_bases x height = 1/2 (8 + 11) x 4 = 38 square units