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= 2(10.6+10t+6t)
248= 2(60+16t)
248=120+32t
120+32t=248
32t= 248-120
32t= 128
t= 128/32
t= 4 cm
248 = 2 ( 10 x 6 + 10 x t + 6 x t )
248 = 2 ( 60 + 10t + 6t )
248 = 2 ( 60 + 16t )
248 = 120 + 32t
120 +32t = 248
32t = 248 - 120
32t = 128
t = 4cm
Jadi tinggi balok = 4cm