Proof: Equilateral Triangle 60 2

Let's prove the following theorem:

if △XYZ is an equilateral triangle, then m∠ZXY = 60

X Y Z

Proof:

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Given
1 △XYZ is an equilateral triangle
Proof Table
# Claim Reason
1 m∠XYZ = 60 if △XYZ is an equilateral triangle, then m∠XYZ = 60
2 m∠XYZ = m∠ZXY if △XYZ is an equilateral triangle, then m∠XYZ = m∠ZXY
3 m∠ZXY = 60 if m∠XYZ = m∠ZXY and m∠XYZ = 60, then m∠ZXY = 60

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