1. Intersecting and parallel lines.
Intersecting lines are lines that cross each other.
Parallel lines are lines that never cross each other - they keep the same distance apart from each other - forever.

2. Alternate angles
Alternate angles form Z shape angles in the parallel lines.
Alternate angles are equal to each other

4. Corresponding Angles
Corresponding angles are equal.
Corresponding angles form F or
shape angles in the parallel lines.

6. 120 c
138 d

7. 55 x z y
115 s r t

8. Allied Angles
Allied / interior angles form C shape angles in the parallel lines.
Allied angles are supplementary, they add up to 180 degrees.

10. 135 a 48 b c d