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450 = 2 (15.10 +15.t +10.t)
= 2 (150 +15t+10t)
= 2 (150 + 25t)
= 300 + 50t
450 -300 = 50t
50t = 150
t = 3
jadi, tingginya itu 3 cm
p = 15
l = 10
t = ?
2pl + 2pt + 2lt
2.15.10 + 2.15 t + 2.10.t = 450
300 + 30t + 20t = 450
50t = 450-300
50t = 150
t = 3