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What's on the worksheet
- Explain why Hiro's ruler and drawing triangle method gives parallel lines.
- Find which lines are parallel from the angles at a transversal.
- Decide which of three lines are parallel from measured angles.
- Use the number sign figure to decide which lines are parallel and prove it.
- Prove lines are parallel from angle information at a transversal.
- Prove two lines are parallel using an angle bisector and equal angles.
Teach it first
The free lesson teaches it with worked examples and practice problems.
Proving lines parallel: the lesson ›More Chapter 2 worksheets: Angle pairs, parallel lines and first proofs
- 2.1Properties of equality and congruence
- 2.2Given, prove and the diagram
- 2.3Two-column and paragraph proofs
- 2.4Proving angle pair theorems
- 2.5The parallel postulate
- 2.6Proving lines parallel
- 2.7Proving alternate interior angles congruent
- 2.8Distance from a point to a line
- 2.9Auxiliary lines
- 2.10Proving the triangle angle sum