Three equilateral triangles.
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we can make a trapezium with 3 equal triangles.
Yes, you can but it take 3 triangles.
It would be impossible. A trapezoid can't have three right angles. It would just make a rectangle.
a parallelogram,a right triangle and a triangle
easy draw a trapezoid (4 sided) and add a triangle to one of the bottom sides (3 sides) ___ / __\ \ /