Proof: One Eighty 4

Let's prove the following theorem:

if a + a = 180, then a = 90

Proof:

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Given
1 a + a = 180
Proof Table
# Claim Reason
1 a + a = a ⋅ 2 a + a = a ⋅ 2
2 a ⋅ 2 = 180 if a + a = a ⋅ 2 and a + a = 180, then a ⋅ 2 = 180
3 a = 90 if a ⋅ 2 = 180, then a = 90

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