RS Aggarwal Solutions for Class 7 Chapter 17 Constructions- It means to draw shapes, angles or lines using compass, ruler and pencil. "Construction" in Geometry means to draw shapes, angles or lines accurately. These constructions use the only compass, straightedge (i.e. ruler) and a pencil. It is the "pure" form of geometric construction: no numbers involved! Constructions refer to a precise way of drawing using two tools, an unmarked straight line and a compass. In this chapter, students are going to learn about the construction of parallel lines and the construction of different types of triangles. Constructions of RS Aggarwal textbook deals with the SSS triangle construction, SAS triangle construction, ASA triangle construction, RHS triangle construction.