a pextongon
You need at least four triangles, or at least three trapeziums. Or two triangles and one trapezium.
There are many possible answers.Three squares will form an L shaped hexagon - a concave hexagon. Three rectangles, if of the correct dimensions will also do so. A quadrilateral and two triangles is another possible answer. Three rhombi,
Two isosceles right triangles, if joined hypotenuse-to-hypotenuse will make a square. Two squares, sided by side, make a rectangle which is a parallelogram, and not a square.
First make a regular hexagon. Then take any one triangle and slide it through two heights so that it's base is on what was the opposite side. You will have an irregular, concave hexagon, shaped somewhat like an arrowhead.
two squares and two triangles
Two squares Two triangles
yes
2 trapaziods, 6 triangles, 3 rombuses, 3 squares (you have to turn them so they look like rombuses almost.
a pextongon
Two triangles can but its an irregular shape
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...
You need at least four triangles, or at least three trapeziums. Or two triangles and one trapezium.
There are many possible answers.Three squares will form an L shaped hexagon - a concave hexagon. Three rectangles, if of the correct dimensions will also do so. A quadrilateral and two triangles is another possible answer. Three rhombi,
All you have to use is the five triangles. The two large triangles make a square in the middle, the two small triangles make a large triangle on one side and the middle triangle on the other side.
Two triangles
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.