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Puzzles

Four points on a shape

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

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If you enjoyed this puzzle, check out Sunday Afternoon Maths XXXIV,
puzzles about 2d shapes, or a random puzzle.

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