You can make a square with 3 right angle triangles
The smaller triangles will be halve the size of the larger triangle
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we can make a trapezium with 3 equal triangles.
a trapazoid
put the triangles upside own under neathe the square the make the trapezoid the head the last triangles the ears
You need at least four triangles, or at least three trapeziums. Or two triangles and one trapezium.
take three match for each triangle