Three triangles.
The shapes cosist of: two triangles and three rectangles.
Triangles can make various shapes depending on their sides and angles. Some common shapes formed by triangles include equilateral triangles (with three equal sides), isosceles triangles (with two equal sides), scalene triangles (with no equal sides), and right triangles (with one 90-degree angle).
triangles
Tow triangles and three rectangles.
Triangles
Impossible shapes. They are four sided shapes with three sides!
Triangles.
triangles
circle
Trapezoid.
There are technically many shapes that could be put into the form of a triangle, but only triangles can make real triangles (without getting into more complicated shapes).