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Lucy from Avoca Beach, Australia wrote to say:

I made triangles using red, green and blue sticks. Red was 3cm, green was 4cm and blue was 5cm.These are all my triangles:
333 334 335 444 344 445 555 554 355 345
There are ten different triangles.

Ruth from Swanbourne House School gave us a little more detail about the triangles:

3 equilateral triangles where all sides are equal (3x3cm, 3x4cm and 3x5cm).
1 right angled triangle, with 1x3cm, 1x4cm and 1x5cm rod.
The other 6 were isoceles triangles, where two of the sides were equal.

Thank you to both of you.