Proof: Angle180 90

Let's prove the following theorem:

Proof:

Proof Table

#	Claim	Reason
1	180 + (90 ⋅ (-1)) = a	if 180 = a + 90, then 180 + (90 ⋅ (-1)) = a (Subtract Both Sides)
2	180 + (90 ⋅ (-1)) = 90	180 + (90 ⋅ (-1)) = 90 (Fixed Value Statement)
3	a = 90	if 180 + (90 ⋅ (-1)) = a and 180 + (90 ⋅ (-1)) = 90, then a = 90 (Transitive Property of Equality Variation 2)

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