Cách sử dụng
A quadrilateral is a shape that has four straight sides and four angles. Some examples of quadrilaterals include squares, rectangles, parallelograms, and trapezoids. You can use the word quadrilateral when talking about different shapes in math, geometry or when describing the perimeter or area of an object with four straight sides. It is a useful word to know if you are studying math or just trying to describe shapes in English.