Proof: Right Angle is 90 Degres

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	m∠ABC = 90	if ∠ABC is a right angle, then m∠ABC = 90 (Right Angle Property)
2	m∠ABC = m∠CBA	m∠ABC = m∠CBA (Angle Symmetry Property)
3	m∠CBA = 90	if m∠ABC = m∠CBA and m∠ABC = 90, then m∠CBA = 90 (Transitive Property of Equality Variation 2)

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