Assuming a value of 30 for x, then 15 x 30 = 450.
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30 2 x 15 = 30 30 2 x 15 = 30
30
1 x 30 2 x 15 3 x 10 5 x 6
Surface area = 2 x area_triangular_ends + areas_of_3_rectangular_faces Surface area = 2 x (15 x 20)/2 + 30 x 15 + 30 x 20 + 30 x 25 = 15 x 20 + 30 x (15 + 20 + 25) = 300 + 30 x 60 = 2100 in2
30 = 1 x 30, 2 x 15, 3 x 10, 5 x 6