5 or 6
Depending on what shape you are thinking of
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2 rhombuses and 2 triangles
10 triangles
10 triangles make a decagon
24 toothpicks.
depends on the side of the triangles?
5
6
it is two 2If they're shaped appropriately, then it only takes two triangles to make a trapezoid.
6
2 rhombuses and 2 triangles
2 rectangles. Put two toothpicks on 2 sides and one on the other side, and that uses 6 toothpicks and if you make another rectangle like that you make 2 rectangles.
100
A minimum of 2 triangles are needed, but you can also make a rectangle with 3 or more triangles.
I think 2
There are 6 triangles in an octagon
10 triangles
10 triangles make a decagon