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Are These Lines Really Parallel—or Is It an Illusion?

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Parallel and Intersecting Lines · Parallel illusions · 3:22

You'll learn: Optical illusions can make parallel lines look bent; check with measurements and angle facts.

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Are These Lines Really Parallel—or Is It an Illusion?

3:22

Playing

Are These Lines Really Parallel—or Is It an Illusion?

You'll learn: Optical illusions can make parallel lines look bent; check with measurements and angle facts.

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Parallel and Intersecting Lines

15

Will These Lines Meet If We Extend Them?
3:36
Will These Lines Meet If We Extend Them?
You'll learn: Will These Lines Meet If We Extend Them?
Four Angles at an Intersection: Measure and Look for Patterns
3:38
Four Angles at an Intersection: Measure and Look for Patterns
You'll learn: Four Angles at an Intersection: Measure and Look for Patterns
Linear Pairs: Why Adjacent Angles Add to 180 Degrees
3:29
Linear Pairs: Why Adjacent Angles Add to 180 Degrees
You'll learn: Linear Pairs: Why Adjacent Angles Add to 180 Degrees
Why Vertically Opposite Angles Are Equal
3:25
Why Vertically Opposite Angles Are Equal
You'll learn: Why Vertically Opposite Angles Are Equal
Why Measurements May Differ from Geometric Predictions
3:44
Why Measurements May Differ from Geometric Predictions
You'll learn: Why Measurements May Differ from Geometric Predictions
Four Equal Angles: Recognising Perpendicular Lines
3:26
Four Equal Angles: Recognising Perpendicular Lines
You'll learn: Four Equal Angles: Recognising Perpendicular Lines
Describing How Line Segments Meet
3:43
Describing How Line Segments Meet
You'll learn: Describing How Line Segments Meet
What Makes Two Lines Parallel?
3:36
What Makes Two Lines Parallel?
You'll learn: What Makes Two Lines Parallel?
Finding Sets of Parallel Lines in a Drawing
3:28
Finding Sets of Parallel Lines in a Drawing
You'll learn: Finding Sets of Parallel Lines in a Drawing
Repeated Paper Folds: Parallel Creases and a Counting Pattern
3:38
Repeated Paper Folds: Parallel Creases and a Counting Pattern
You'll learn: Repeated Paper Folds: Parallel Creases and a Counting Pattern
Making Parallel Diagonal Folds and Folded Triangles
3:39
Making Parallel Diagonal Folds and Folded Triangles
You'll learn: Making Parallel Diagonal Folds and Folded Triangles
Marking Parallel and Perpendicular Lines Correctly
3:43
Marking Parallel and Perpendicular Lines Correctly
You'll learn: Marking Parallel and Perpendicular Lines Correctly
Drawing Perpendicular Lines on Dot Paper
3:29
Drawing Perpendicular Lines on Dot Paper
You'll learn: Drawing Perpendicular Lines on Dot Paper
Drawing Parallel Lines on Dot Paper
3:31
Drawing Parallel Lines on Dot Paper
You'll learn: Drawing Parallel Lines on Dot Paper
Which Slanted Line Is Really Parallel?
3:32
Which Slanted Line Is Really Parallel?
You'll learn: Which Slanted Line Is Really Parallel?