quadrilaterals
All four-sided figures are quadrilaterals.
No. There are some figures that don't have a name that are five sided.
yes
There exists at least one quadrilateral which is not 4-sided.
Yes.
Same as all other four sided figures, 360o
yes they are all four sided figures classifying them as quadrilaterals
All four sided figures have the same sum in degrees. 360.
because they have four sides, which is the definition of quadrilateral
All six-sided two dimensional figures are hexagons.
Quadrilateral.
quadrilaterals