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BALOK
lebar ada 4 tangkai
panjang ada 4 tangkai
tinggi ada 4 tangkai
panjang artinya 20 x 4 = 80
lebar artinya 15 x 4 = 60
180-80-60= 40
nah artinya sisanya 40 : 4 = 10 cm
maka tinggi kerangka balok adalah 10 cm
= [ 180 - 140 ] : 4
= 40 : 4
= 10 cm
= ( B )