Angles & Lines

Straight angles and parallel lines

An interactive lesson with 6 steps, about 5 minutes: you predict, drag and solve, with instant feedback on every answer. It runs in your browser and needs JavaScript.

What you’ll learn

• Angles on a straight line add up to 180°. All the way around a point is 360°.
• Vertically opposite angles are equal.
• With parallel lines, corresponding angles are equal and co-interior angles add up to 180°.

Steps

1. On a straight line
2. Crossing lines
3. Next door
4. Parallel lines
5. Same side
6. Count them