RS Aggarwal Solutions for Class 8 Chapter 17 “Construction of Quadrilaterals” We know that a quadrilateral has ten parts in all: four sides, four angles and two diagonals. These two triangles together will form a quadrilateral. Construction of quadrilaterals when four sides and one diagonal are given. As the Chapter is about Construction of Quadrilaterals, we learn how to construct a Quadrilateral by following certain steps provided.