It is a square with a right angle triangle attached to it having the same height as the 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!
You can do it only of the triangle is right angled and if one of its legs is the same length as the side of the square. In that case, let that side of the triangle abut a side of the square.
..._________________ ...\............/................../ ....\........../................../ .....\......../................../ ......\....../................../ .......\..../................../ ........\../................../ .........\/_________/ .........^triangle...^ ..........................^rhombus/parallelogram made from one trapezoid.
triangle and rhombus.