# Geometry Ch.2 Notes Page 5 P5  2­5 Proving Angles Congruent

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Geometry
Ch.2 Notes Page 5
P5 2&shy;5 Proving Angles Congruent
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Given: Proof.
What do we know about 1 and 2? _______________________________
What do we know about 3 and 2? ________________________________
So now we can say _____________________ = ________________________ by substitution.
What happens if we subtract 2 from both sides of the equation, what are we left with? ___________________________
What conclusion can we make? If two angles are _____________________ of the _______________ angle, then the two angles are &shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;&shy;____________________________.
This is the ________________________________________________ Theorem.
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Find the value of each variable and label each angle measure.
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5.
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6.
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HW #5
2&shy;5 P112 #1&shy;6,12&shy;15