Grade 3/Geometry
Parallel and Perpendicular Lines (700)
Identify and classify pairs of lines as parallel (lines that never meet and are always the same distance apart), perpendicular (lines that meet at a right angle of 90°), or intersecting (lines that cross but not at a right angle).
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Quick Tip
Parallel lines never meet. Perpendicular lines cross at exactly 90°. Intersecting lines cross but are not perpendicular.
Teacher Resources
Standards
CCSS.MATH.CONTENT.3.G.A.1Teaching Notes
Emphasize definitions and visual cues for each line type. Discuss real-world examples to aid comprehension.
Vocabulary
Parallel: Lines that never cross.
Perpendicular: Lines that cross at a right angle.
Common Mistakes
- Calling all crossing lines perpendicular (must be 90°)
- Thinking parallel lines must be horizontal (can be any direction)
- Not noticing the right angle square indicator
- Confusing intersecting with perpendicular (check the angle)
- Confusing intersecting with perpendicular.
- Misidentifying parallel lines.
- Forgetting right angle symbol.
- Ignoring line extent.
Differentiation
SupportUse physical manipulatives like straws or rulers.
ChallengeFind examples in complex geometric figures.
Discussion Questions
- When do lines appear parallel?
- What defines a right angle?
- Can perpendicular lines be parallel?
- Where do you see these lines daily?
Extension Activities
- Draw parallel lines.
- Draw perpendicular lines.
- Find intersecting lines.
Parent Tip
Point out parallel and perpendicular lines on buildings or signs.
Learning Path
Skill Cluster
Geometry Fundamentals
Estimated Time
15 minutes
Skills Practiced
Identifying parallel lines (never meet)Identifying perpendicular lines (meet at 90°)Identifying intersecting lines (cross but not at right angle)Recognizing right angle symbol (small square)Understanding line relationshipsApplying geometric vocabulary
Prerequisites
- 699
- Identifying points, lines, rays
- Understanding angles
Next Steps
- Classifying angles (acute, obtuse)
- Identifying lines in shapes
- Classifying Angles
- Identifying Polygons
- Symmetry Basics