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Db2=p2+l2
Db2=12*12+8*8
Db2=144+64
Db2=208
Db=√208
2.Cari tinggi balok
t2=Dr2-Db2
t2=17*17-√208
t2=289-208
t2=81
t=√81
t=9
Jadi,tingginya 9 cm
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