Transitive Property of Equality Variation 2
Distance Property 1
Distance Property 2
Distance Property 3
Angle Symmetry Example 2
Collinear Angles Property 9
Transitive Property Application 2
Angles of an Isosceles Triangle
Angle Symmetry Example
Angle Symmetry 2
Isosceles Triangle 2
Transitive Property of Equality Variation 1
Perpendicular to Angle
Collinear Then 180
Subtract Both Sides
Add Term to Both Sides 6
Subtract Both Sides 2
Add Term to Both Sides 7
Vertical Angles
Angle Addition Theorem
Collinear Angles B
Exterior Angle
Exterior Angle B
Collinear Angles Property 10
Collinear Angles Property 3
Collinear Angles Property 3 B
Collinear Angles Property 3 C
alternate interior angles then parallel
ParallelThenAIA
Parallelthenaiashort
Commutative Property Example 2
Commutative Property Variation 1
Substitution 2
Substitution 8
Angle Symmetry B
Substitution Example 10
Substitute First Term
Triangles Sum to 180
Equality Example
If Two Angles Equal Then Three Angles Equal
Angle Angle Side Triangle
Altitudes Isosceles

Proof: Collinear Angles Property 3

Let's prove the following theorem:

if m∠CBA = 180, then m∠XAC = m∠XAB

A C B X

Proof:

View as a tree | View dependent proofs | Try proving it

Given
1 m∠CBA = 180
Proof Table
# Claim Reason
1 m∠XAB = m∠XAC if m∠CBA = 180, then m∠XAB = m∠XAC
2 m∠XAC = m∠XAB if m∠XAB = m∠XAC, then m∠XAC = m∠XAB
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