There are quite a few. Circles, squares, triangles...
A triangular prism
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.
Squares and polygons. DumbA**
two squares and two triangles
A polygon is described as being a plane shape with straight sides as a two dimensional shape. Some examples include triangles, squares, and rectangles.
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.
the shape that can make two smaller triangles is parallelogram.
Two squares Two triangles