Proof: Divide 180 by 2

Let's prove the following theorem:

if a = 180 ⋅ (1 / 2), then a = 90

Proof:

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Given
1 a = 180 ⋅ (1 / 2)
Proof Table
# Claim Reason
1 180 ⋅ (1 / 2) = 90 180 ⋅ (1 / 2) = 90
2 a = 90 if 180 ⋅ (1 / 2) = 90 and a = 180 ⋅ (1 / 2), then a = 90

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