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= 40
La = 8 x 15 : 2
= 60
luas permukaan
Lp = 2(La ) + kxt
600 = 2(60) + 40 x t
600 = 120 + 40t
600-120=40t
480 = 40t
480/40 = t
12 = t
jawabnnya adalah 12 cm
600 = 2 x 1/2 x 8 x 15 + (8+15+17) x t
600 = 120 + 40t
40t = 480
t = 480/40 = 12 cm