No, a decagon is not a quadrilateral.
4
guadrilateral
4
rectangle
it is a square
A trapezoid
rhombus
Trapazoid
A 4 sided quadrilateral can never have 4 obtuse angles.
No because the 4 interior angles of a 4 sided quadrilateral must add up to exactly 360 degrees.
A trapezoid is a 4 sided quadrilateral with no lines of symmetry unless it's an isosceles trapezoid Also parallelograms have no lines of symmetry unless it is a rectangle