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152 = 4(18 + 12 + t)
152 = 4(30 + t)
152 = 120 + 4t
152 - 120 = 4t
32 = 4t
8 = t
Jadi tingginya adalah 8 cm.
4( 18 + 12 + t)= 152
4( 30 + t)= 152
120 + 40t= 152
4t= 152 - 120
4t= 32
t= 32/4
t= 8
Jadi, tingginya adalah 8 cm.