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p = 20cm
l = 17 cm
t?
20 x 4 = 80 cm
17 x 4 = 68 cm
80 + 68 = 148 cm
180 - 148 = 32 cm
32 : 4 = 8 cm
jadi tingginya adalah 8 cm
kerangka balok = 4 × [p + l + t]
180 = 4 × [20 + 17 + t]
180 ÷ 4 = 37 + t
45 = 37 + t
t = 45 - 37
= 8 cm