Maths Puzzles for KS3/KS4
IntroductionNumberFractionsAlgebraLogicSpatialTricksOpticalResources

Straight lines?

Resources

Teaching notes

In each of these optical illusions, the vertical lines are parallel. The other elements of the diagrams make them appear to bend or slant.

The puzzles could be used to introduce a lesson on parallel lines, as a fun way to revise the definition of ‘parallel’, or to help students see that estimating without measuring can be misleading.

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