m∥nm∠2=60° given
∠8≅∠2
m∠8=m∠2 angle congruence postulate
m∠8=60° substitution pr...
Mathematics, 22.11.2019 02:31 princessmnicole2
m∥nm∠2=60° given
∠8≅∠2
m∠8=m∠2 angle congruence postulate
m∠8=60° substitution property of equality
m∠7+m∠8=180° linear pair postulate
m∠7+60°=180° substitution property of equality
m∠7=120°
subtraction property of equality
alternate interior angles theorem
division property of equality
alternate exterior angles theroem
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