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'Tri-five' printed from http://nrich.maths.org/
Find all the DIFFERENT shapes that can be made by joining five
equilateral triangles edge to edge.
Here's an example:
You might like to use this interactivity to try out your
ideas. Click the red triangle to make a new triangle appear. You
can move the triangles around by dragging with your mouse. If you
hover your mouse over a corner, you will see a white circle where
you can click to rotate the triangle.
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