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550 = 2(150) + 2(15t) + 2(10t)
550 = 300 + 30t + 20t
-50t = -250
t = 5
panjang = 15 cm
lebar = 10 cm
LP = 550 cm²
mk :
LP = 2 x (pxl + pxt + lxt)
550 = 2 x (15x10 + 15t + 10t)
550 = 2 x (150 + 25t)
550 = 300 + 50t
t = 500-300/50
t = 4 cm
jadi tinggi balok = 4 cm