Answer:
a) c ║ d CACP
b) a ║ b AICP
c) c ║ d CACP
d) a ║ b SSIASP
Explanation:
CACP - Corresponding Angles Congruent postulate
When two parallel lines are cut by a transversal, the pairs of corresponding angles (in the same relative position on different intersections) are congruent.
AICP - Alternate Angles Congruent postulate
When two parallel lines are cut by a transversal, the resulting alternate interior angles (opposite sides of the transversal line) are congruent .
SSIAS - Same Side Interior Angles Supplementary theorem
When two parallel lines are cut by a transversal, the resulting pairs of consecutive interior angles formed are supplementary (sum to 180°).
a) c ║ d CACP
The tranversal is line b
b) a ║ b AICP
The tranversal is line d
c) c ║ d CACP
The tranversal is line a
d) a ║ b SSIASP
The tranversal is line c