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Parallel lines

Vertically opposite angles are equal

Unlocks in Lesson 1: Where two lines cross →

Parallel lines

Angles on a straight line add to 180°

Unlocks in Lesson 1: Where two lines cross →

Parallel lines

Corresponding angles are equal — F

Unlocks in Lesson 2: Pairs on parallel lines →

Parallel lines

Alternate angles are equal — Z

Unlocks in Lesson 2: Pairs on parallel lines →

Parallel lines

Co-interior angles add to 180° — C

Unlocks in Lesson 2: Pairs on parallel lines →