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red dots, we call it lids blue dots, we call it body
63cm = 10 lids + 2 body 59.4cm = 7 lids + 2 body
if we minus the 2 equations
63 - 59.4 = 3 lids
3 lids → 3.6
PQ → 4 lids
1 lid → 3.6 ÷ 3 = 1.2 4 lids (PQ) → 4 x 1.2 = 4.8 cm