Jllk m_1=m_3
1
2
3
Prove:
Tilm
2
If alternate interior angles are =
1. jllk, m 23 = m Z1
then lines are II.
2. mZ1 = m22
4
Substitution
3. Alm
Given
3
If lines are II, then corresponding
4. m2 = m23
angles are

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