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Permanent link to this puzzle: mscroggs.co.uk/puzzles/92

Source: UKMT Senior Maths Challenge 2014

Fiona wants to draw a 2-dimensional shape whose perimeter passes through the points A, B, C and D

Which of the following shapes can she draw?

(i) A circle

(ii) An equilateral triangle

(iii) A square

If you enjoyed this puzzle, check out Sunday Afternoon Maths LX,

puzzles about hexagons, or a random puzzle.

puzzles about hexagons, or a random puzzle.