Could Quadrilaterals have right angles

Answer 1

Quadrilaterals are a generic class of polygons (shapes that have only straight sides) that simply have 4 sides. "Quadrilateral" literally means "4-sided". Given that, I'm sure you can think of 2 very common quadrilaterals that have right angles: the "rectangle", and a special form of rectangle called a "square". The name "rectangle" literally means "right angle", and is called such because all 4 sides of this type of quadrilateral are connected by right angles. A square is a rectangle, all four of whose sides are equal in length. So a square is a rectangle is a quadrilateral.