149. AB/MN = CD/EF
AB = 5սմ
CD = 80մմ = 8սմ
MN = 1դմ = 10սմ
EF = ?

5/10 = 8/EF
5EF = 80
EF = 16

155. AB = 4, BC = 5, CA = 7
KM/AB = 2,1
KMN_կողմեր — ?

KM = KM/AB : 4 = 2,1 : 4 = 8
MN/BC = KM/AB
MN/5 = 8/4
4MN = 40
MN = 10
KN/AC = MN/BC
KN/7 = 10/5
5KN = 70
KN = 14

154. <A = 106^O, <B = 34^O, <E = 106^O, <F 40^O, AC = 4,4, AB = 5,2, BC = 7,6, DE = 15,6, DF = 22,8, EF = 13,2

<BCA = 180 — (106 + 34) = 40^O
<EDF = 34^O
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