Explanation:
Statement Reason
m∠KER = m∠MEN Given
m∠KER = m∠1 + m∠2 Angle addition
m∠MEN = m∠2 + m∠3 Angle addition
m∠1 + m∠2 = m∠2 + m∠3 Substitution property of equality
m∠1 = m∠3 Subtraction property of equality
proved
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