This chapter introduce students about the theorems present in the topics of Lines and Angles and the basic Geometry primarily focusing on the properties of the angles formed i) when two lines intersect each other and ii) when a line intersects two or more parallel lines at distinct points. Students might often be asked to prove the statements given in the questions. Chapter consists of 3 exercises in the chapter, solving which students would be able to understand the concepts covered in the chapter thoroughly. There are four axioms and eight theorems covered in the chapter.