Triangles (four of) and a square.One square as base and four triangles as sides.
Four equilateral triangles make up another equilateral triangle.
3 triangles make up a hexagon.
There are an infinite number of options. Even sticking with polygons with sides of the same measure, a hexagon can be made from 6 equilateral triangles, or 4 eq triangles and a 60 degree rhombus, or 2 eq triangles and 2 60-deg rhombi, or 3 60-deg rhombi. Each of the equilateral triangle could be made from smaller shapes. Eg four equilateral mini-triangles to make 1 triangle. Or 2 mini-triangles and 1 mini-rhombus or 2 60-deg mini-rhombi. And then each of those mini triangles could be made up of smaller micro-shapes. And so on ...
There is no specific name. The resulting shape depends on the relative sizes and shapes of the original gemetric shapes and how they are used to "make up" a shape. For example, two rectangles can make up one rectangles, a hexagon, a heptagon, an octagon, a nonagon, a dodecagon, a triskaidecagon (13) or a hexadecagon (16). There may be others. Using more shapes or more complicated ones will greatly increase the number of possible outcomes. Furthermore, there is no reason to be restricted to polygons.
Two trapezoids can make up a hexagon.
well that is easy its 3 rhombuses
A hexagon and a rectangle.
Hexagon, heptagon, octagon, nonagon all have more sides than a pentagon
A square can be drawn with four lines.
A 6 sided hexagon has 6 angles that add up to 720 degrees
You start creating a concave hexagon from four triangles by placing the smallest triangle in the middle to serve as a base for the other three. Line up the bases on each triangle with the sides of the smallest one to end up with six sides forming a concave hexagon.
Triangles (four of) and a square.One square as base and four triangles as sides.
Four equilateral triangles make up another equilateral triangle.
3 triangles make up a hexagon.
The answer depends on the shapes and sizes of the triangles. I can make a big triangle, a quadrilateral, pentagon, hexagon, etc up to 12 sides.
Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon