This question depends on the exact shapes of the triangles in question. If they have right angles and are congruent, place them in this order: up and facing left; up and facing right; down and facing left; up and facing right. The two middle triangles form a square.
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A trapezoid and a triangle can make a triangle or another trapezoid, among others.
No because a trapezoid has 4 sides and a triangle has three if a trapezoid had three then it would be a triangle. If you had 3 trapezoids you could make a triangle!
..._________________ ...\............/................../ ....\........../................../ .....\......../................../ ......\....../................../ .......\..../................../ ........\../................../ .........\/_________/ .........^triangle...^ ..........................^rhombus/parallelogram made from one trapezoid.
triangle and rhombus.
A triangle cannot be formed by any number of trapezoids. Every time a trapezoid is stretched across one side of a triangle, a smaller triangle similar to the first is formed by the part not covered by the trapezoid. Unless... the triangle was equilateral and the trapezoids were isoceles. You could fill the triangle with 3 trapezoids as follows: Use the longer 'bottom' edge of each trapezoid and the 'left' edge of the next trapezoid to make up the edge of the triangle. The shorter 'top' edge of the trapezoids touch the 'right' edge of the next trapezoid in the center of the triangle.