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Verified answer
D1 = 80 cmd2 = 60 cm
t = 60 cm
s^2 = (1/2 d1)^2 + (1/2 d2)^2
s^2 = (1/2(80))^2 + (1/2(60))^2
s^2 = 40^2 + 30^2
s^2 = 1600 + 900
s^2 = 2500
s = V(2500)
s = 50 cm
L = L alas + 4 (L sisi tegak)
L = (1/2×d1×d2) + (4×s×t)
L = (1/2×80×60) + (4×50×60)
L = 2400 + 12000
L = 14400 cm^2
Jadi luas permukaannya adalah 14400 cm^2