BC = 19.1-10.4 = 8.7
19) AB = BC = 8.7
20) CG = 30.6 -8.7 =21.9
21) AG = 8.7 +30.6 = 39.3
22) FG = DG (DG = 30.6-10.4-8.7) = 11.5
23) EH = 8.7 + 11.5 +8.7 = 28.9
24) EJ = 8.7 + 11.5 + 21.3 = 41.5
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