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Lalas = 8 + 20 x tinggi trapesium /2
= 28 x 9 /2 = 126 cm2
Kalas = 8 + 9 + 20 + 15 = 52 cm
Lpermukaan prisma = (2 x Lalas) + (Kalas x Tprisma)
= (2 x 126 cm2) + (52 x 10)
= 252 + 520 = 772 cm2
7) tinggi trapesium = akar dari 25^2 - 20^2 = 15 cm
Lalas = a+b x tinggi trapesium / 2 = (50 + 90) x 15 x 2
= 140 x 15 /2 = 70 x 15 = 1050 cm2
Kalas = 50 + 90 + 25 + 25 = 240 cm
Lpermukaan = (2 x Lalas) + (Kalas x Tprisma)
= (2x1050) + (240x180)
= 2100 + 43200
= 45.300 cm2