The all have 2 or more sides
They all have exterior angles that add up to 360 degrees.
A pentagon has 5 sides and a trapezoid ha 4 sides
A trapezoid and a triangle can make a triangle or another trapezoid, among others.
Two trapezoid
No because a trapezoid has 4 sides and a triangle has three if a trapezoid had three then it would be a triangle. If you had 3 trapezoids you could make a triangle!
The all have 2 or more sides
triangle
They all have exterior angles that add up to 360 degrees.
Bigger triangle, a parallelogram or a pentagon.
They are all polygons.
-- trapezoid -- triangle -- irregular quadrilateral -- pentagon -- hexagon etc.
A scalene triangle, A trapezoid, an irregular pentagon.
Depending on how you combine them.You could have a trapezoid or a pentagon.
A big triangle if you put the triangle on the trapezoid's short parallel side, or a parallelogram if you put it on one of the trapezoid's ends. In both cases the triangle must be exactly the right shape and size or you will only have an irregular quadrilateral, pentagon, or hexagon. (Placing an appropriately-sized triangle on the long parallel side will also yield a pentagon - likely irregular.) Additionally, if a vertex of the triangle touches the trapezoid it can also make an irregular concave heptagon!
A pentagon and a triangle are both polygons. There are three triangles in a pentagon. Both a triangle and a pentagon have exterior angles that add up to 360 degrees
A pentagon has 5 sides and a trapezoid ha 4 sides
triangle circle square octagon pentagon hexagon trapezoid