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672=4(√(16²+12²)×t)+2(1/2×12×16)
672=4(√(256+144)+2(6×16)
672=4(√400×t)+192
672=4(20t)+192
672=80t+192
-80t=192-672
-80√7t= -480
t= -480÷(-80t)
t= 6cm