Թեմա՝ ուղիղ, հատված, անկյուն, զուգահեռ ուղիղներ

AB = 15
MB = 15/2 = 7,5

PN = 21 — 8 = 13

<ABC = 140^o
<ABD = <DBC
<DBE = <EBC
<ABD, <DBE, <EBC, <ABE = ?

140 : 2 = 70 (ABD)
70 : 2 = 35 (DBE = EBC)
70 + 35 = 105 (ABE)

<4 = <5 Այո

❤ = 70^o, <5 = 110^o Այո

1. AB = CD = 12
AC = 2CB
C ∈ AB
B ∈ AD
AD = ?

CB = x
AC = 2x

AB = AC + CB = 12
x + 2x = 12
3x = 12
x = 4

CB + BD = CD
4 + BD = 12
BD = 8
AD = AC + CB + BD = 20

2. 8 — 4 = 4

3. BD = AO = OB = 8 + 4 / 2 = 6
OM = AD — AO — MD = 2 — 6 — 6 = 8

4. 2

<AOB = 4BOC
<BOC = ?

AOC = 180^O

4α + α = 180^O
α = 36^O