Răspuns:
Explicație pas cu pas:
AB/DC = EB/EC = EB/(EB + BC)
15/35 = EB/(EB + 12)
15(EB + 12) = 35EB
15EB + 180 = 35EB
35EB - 15EB = 180
20EB = 180
EB = 180 : 20 = 9 hm
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AB/DC = AE/DE = AE/(AE + AD)
15/35 = AE/(AE + 14)
15(AE + 14) = 35AE
15AE + 210 = 35AE
35AE - 15AE = 210
20AE = 210
AE = 210 : 20 = 10,5 hm
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P = AB + AE + BE = 15 + 10,5 + 9 = 34,5 hm
