A rectangle..
If you combine the triangles to make another square and then place all the squares in a row it makes a rectangle.
you can also make a trapezium, if you place the 2 squares next to each other and then the triangles beside them...
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A rhombus.
Make a two by two grid with six toothpicks, and then place the other two toothpicks at a 45 degree angle on the corner of two of the squares.
Parellelogram
If two angles and the side opposite one of them in one triangle are equal to one side and two similarly located angles in a second triangle then the two triangles are congruent. (The triangles are exactly the same shape and size as each other).
In geometry two figures are congruent if they have the same shape and size if they are non congruent they do not have the same shape and size two triangles are congruent if their corresponding sides are all equal in lengh and their corresponding angles are equal in size