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).
No two equilateral triangles do not make a square but two right triangles do.
There are quite a few. Circles, squares, triangles...
A triangular prism
a rectangle
rectangle
a pextongon
It depends on the symmetry. Work out the area of half the shape by filling the shape with squares and triangles of known areas and times the answer by two.
A polygon is described as being a plane shape with straight sides as a two dimensional shape. Some examples include triangles, squares, and rectangles.
Squares and polygons. DumbA**
Take two equally sized squares on top of each other, rotate one of them 45degrees to the other. You then get 8 triangles around an octagon in the center.
two squares and two triangles
Two squares Two triangles
the shape that can make two smaller triangles is parallelogram.