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The total surface area of the triangular prism represented by this net is 410.8 square cm.
Calculations:
2(15 x 8) = 2(120) = 240
1(15 x 6) = 90
(8 x 8.3)/2 = 33.2
(8 + 8 + 6)8.3/2 = 66.4
240 + 90 + 33.2 + 66.4 = 430.6 square cm