A quadrangle is a shape with 4 angles, such as a square, rectangle, or paralellogram. A four sided shape is called a quadrilateral.
A trapezoid is a quadrangle.
No, but a parallelogram is a quadrangle.
Yes, a trapezoid is a quadrangle because a quadrangle has four sides and a trapezoid has four sides.
It is an equilateral quadrangle.
An invisible quadrangle!
Yes it is one
It can be in some cases.