Assuming that the 3 lengths refer to the sides of a triangular shape, the area is 21.331 cm2
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Area = 1/2*(14+12)*8 = 104 square cm
Surface area = 2*(12*8 + 8*9 + 9*12) sq cm = 2*(96 + 72 + 108) = 552 cm2
48 cm^2
6 centmeters
6 centimeters Check: 1/2*8*6 = 24 cm2