Statement 1: [tex]\angle 2[/tex] and [tex]\angle 4[/tex] are vertical angles
Reason 1: Given
We basically just restate the given information word for word. This is true of any two column proof.
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Statement 2: [tex]m \angle 2 + m \angle 3 = 180[/tex]
Reason 2: [tex]\angle 2[/tex] and [tex]\angle 3[/tex] are a linear pair
The term "linear pair" means the angles are adjacent and supplementary (they form a straight line), so this is why the two angles add to 180.
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Statement 3: [tex]m \angle 3 + m \angle 4 = 180[/tex]
Reason 3: [tex]\angle 3[/tex] and [tex]\angle 4[/tex] are a linear pair
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Statement 4: [tex]m \angle 2 + m \angle 3 = m \angle 3 + m \angle 4[/tex]
Reason 4: Substitution
Each of the equations formed in statements 2 and 3 above have 180 on the right side, so the left hand sides must be the same
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Statement 5: [tex]m \angle 2 = m \angle 4[/tex]
Reason 5: Subtraction property of equality
We subtracted the quantity [tex]m \angle 3[/tex] from both sides (they go away)
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Statement 6: [tex]\angle 2 \cong \angle 4[/tex]
Reason 6: Definition of congruence
If two items are congruent, then they have the same measure. In other words, they are the same.
The proof of [tex]\angle 2 \ and \ \angle4[/tex] are vertical angles is explained below.
Given, [tex]\angle 2 \ and \ \angle4[/tex] are vertical angles as shown in fig.
We know that, Vertical angles are formed when two straight lines intersect at a point.Vertical angles are two angles which are vertically opposite and have the same measure. So, the two angles are to be congruent.
We have to prove that angle 2 and angle 4 congruent.
Given [tex]\angle 2 \ and\ \angle 3[/tex] makes linear pair so,
[tex]\angle 2+\angle 3= 180[/tex]
[tex]\angle 3 =180-\angle 2[/tex]..........(1)
Again [tex]\angle 3 \ and \ \angle 4[/tex] makes linear pair so,
[tex]\angle 3+\angle 4= 180[/tex]
[tex]\angle 3 =180-\angle 4[/tex].......(2)
From (1) and (2) we get,
[tex]180-\angle 2=180-\angle 4[/tex]
Subtracting 180 from both the sides we get,
[tex]-\angle 2=-\angle 4[/tex]
Or, [tex]\angle 2=\angle 4[/tex]
Hence angle 2 and angle 4 are congruent.
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