Students correct three line errors — parallel lines described as crossing at right angles, a ray given two endpoints, and perpendicular lines forming 180°. Part B has four fill-in-the-blank questions about parallel lines, line segment endpoints, and the angle perpendicular lines form. Part C has two short-answer questions about the line-versus-ray difference and everyday parallel line examples.
Correcting the parallel/perpendicular confusion and the ray/segment confusion addresses the two most persistent line-type errors.
Style:
Lines and Symmetry
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
Parallel lines cross each other at a right angle.
Rewrite: Perpendicular lines cross each other at a right angle. Parallel lines never cross.
2. Fix the sentence:
A ray has two endpoints and goes on forever in both directions.
Rewrite: A ray has one endpoint and goes on forever in one direction.
3. Fix the sentence:
Perpendicular lines form a 180° angle where they meet.
Rewrite: Perpendicular lines form a 90° angle where they meet.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. Lines that never meet and stay the same distance apart are called parallel lines.
2. A line segment has two endpoints.
3. Perpendicular lines form right angles where they cross.
4. A line goes on forever in both directions.
Part C: Short Answer
Answer each question in one or two complete sentences.
1. What is the difference between a line and a ray?
A line goes on forever in both directions with no endpoints, while a ray has one endpoint and goes on forever in only one direction.
2. Give an example of parallel lines you see in everyday life.
The two rails of a railroad track are parallel lines because they run side by side and never cross.
Lines and Symmetry
★ Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1) Fix the sentence:
Parallel lines cross each other at a right angle.
Rewrite: Perpendicular lines cross each other at a right angle. Parallel lines never cross.
2) Fix the sentence:
A ray has two endpoints and goes on forever in both directions.
Rewrite: A ray has one endpoint and goes on forever in one direction.
3) Fix the sentence:
Perpendicular lines form a 180° angle where they meet.
Rewrite: Perpendicular lines form a 90° angle where they meet.
★ Part B: Fill in the Blank
Write the missing word or number on each line.
1) Lines that never meet and stay the same distance apart are called parallel lines.
2) A line segment has two endpoints.
3) Perpendicular lines form right angles where they cross.
4) A line goes on forever in both directions.
★ Part C: Short Answer
Answer each question in one or two complete sentences.
1) What is the difference between a line and a ray?
A line goes on forever in both directions with no endpoints, while a ray has one endpoint and goes on forever in only one direction.
2) Give an example of parallel lines you see in everyday life.
The two rails of a railroad track are parallel lines because they run side by side and never cross.
Ready to Practice?
Complete each section carefully.
9 Questions
15-20 minutes
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