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prisma dgn alas Δ siku2
a = 9cm
b = 12cm
c = 15cm
t prisma = 10cm
Dit: Lpermukaan prisma...?
Lp = 2 (La) + Ka . t
Lp = 2 (1/2 a b ) + (a+b+c) t
Lp = 2 (1/2 x 9 x 12) + (9+12+15) x10
Lp = 2 (54) + (36) x10
Lp = 108 + 360
Lp = 468 cm²
Luas permukaan prisma 468 cm²