One must understand some of the basic definitions of lines and angles in geometry to be able to solve these questions. These concepts even help the students when they take several competitive exams in their near future.
Lines: To begin with, a line segment is a part of a line that has a definite length with two endpoints. A straight line is of infinite length.
Angle: An angle is formed by 2 rays. A two pair of opposite angles are formed when two lines intersect each other and these angles are termed as vertical angles. They are always coherent. Adjacent angles are angles that do not overlap or that share a common ray. A ray indefinitely extends in one direction and it has 1 endpoint.
Furthermore study the various properties of angles, lines and learn how to solve problems based on these concepts from the RD Sharma class 7 maths textbooks. The detailed RD Sharma solutions for class 7 maths is given here in detail. Check the solutions to clear all the doubts and learn more effectively.