Vertical Angles Theorem: Algebra Proof
Preliminary version
How do we know that angle a + b = 180 degrees and angles b + c = 180 degrees?
Linear Pair Postulate
Addition Property of Equality
Angle Congruence Postulate
Substitution Property of Equality
How do we know that angles a + b = b + c ?
Substitution Property of Equality
Linear Pair Postulate
Addition Property of Equality
Angle Congruence Postulate
How do we know that angles a = c ?
Addition Property of Equality
Angle Congruence Postulate
Subtraction Property of Equality
Substitution Property of Equality
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