The diagram shows part of a tessellation of the plane by a quadrilateral.
Khelen wants to colour each quadrilateral in the pattern so that no twoquadrilaterals that meet (even at a point) have the same colour.What is the smallest number of colours he needs?
Select one option, then click Submit.
3
4
5
6
7
Select an option, then submit.
Sign in or create an account to reveal answers, view the solution, and save your progress. Create a free account to unlock practice and keep track of your work.
Intermediate Mathematical Challenge 2019 (2019)
One puzzle per day. Cryptarithm, Magic Square, Summit. No sign-up required to play.
Play daily puzzle →Interactive problems and curated lessons—water pouring, magic squares, knight's tour, and more.
Browse library →See how you rank. Top solvers by problems solved correctly. Sign in to climb the ranks.
View leaderboard →Intermediate Mathematical Challenge 2019 (2019)