How many lines are there in your diagrams? How many lines are there in the original diagram? Can you find a way of working out the number of lines without counting them? Can you explain your method?
Are these two diagrams the same or different? Explain your answer
MYSTIC ROSE GAME Draw a Mystic Rose with 6 points and label them A to F. Players take turns to colour an uncoloured line joining two of the six points A, B, C,… so that it avoids the creation of a triangle with all its edges in their colour. Only triangles with vertices at three of the points A, B, C, D, E and F are included, intersection points are not relevant. Players must colour a line when it is their turn. The loser is the player who completes one of the forbidden triangles, either by mistake or because there is no other move to make.
The game can be played on the phone. Players tell each other which line they are colouring by naming the line AB or AC… etc. Played blindfold, it is good training in concentration, visualization and memory.
Click here for a template of circles so you can draw lines and investigate these patterns.
Click here to download the MYSTIC ROSE AND HANDSHAKES Inclusion and Home Learning Guide.
Click here for the Mystic Rose worksheet.
Click here for the Notes for Teachers.
This problem is adapted from the NRICH task Mystic Rose with permission of the University of Cambridge. All rights reserved.
See also the NRICH Mystic Rose Poster.