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Parallelogram It

Age 11 to 16
Challenge Level Yellow star
Secondary curriculum
  • Problem
  • Getting Started
  • Student Solutions
  • Teachers' Resources

This game is part of a set of three. We recommend you play this version after having a go at Square It and before having a go at Rhombus It.

The Teachers' Resources for Square It contain all our suggestions for how these games and interactivities might be used in the classroom.

Please be aware that in Parallelogram It, Player 1 can always win in just four moves!
You may want to challenge students to explain why Player 2 cannot stop Player 1 from winning.

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Long Short

What can you say about the lengths of the sides of a quadrilateral whose vertices are on a unit circle?

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The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice.

NRICH is part of the family of activities in the Millennium Mathematics Project.

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