(i) m and n are parallel lines. l is the transversal
∴ Corresponding angles are equal
(ii) m and n are parallel lines l is the transversal
Exterior angles that lie on the same side of the transversal are supplementary
∴ (4a + 13) + 135° = 180°
4a + 13 + 135° = 180°
4a + 148° = 180°
4a + 148° – 148° = 180° – 148°
4a = 32°
(iii) m and n are parallel lines l is the transversal
∴ Alternate interior angles are equal
(iv) m and n are parallel lines l is the transversal
Which is perpendicular to m and n
