In geometry, lines play a crucial role in defining the shape and structure of various figures. There are different types of lines based on their relationship to each other. Parallel lines are lines that never intersect and maintain a consistent distance from each other. Perpendicular lines intersect at a right angle, forming 90 degrees. Intersecting lines, as the name suggests, intersect at a common point.

Angles are formed by the intersection of two lines or line segments and can be classified based on their measurements. A right angle measures exactly 90 degrees. An acute angle is less than 90 degrees, while an obtuse angle is greater than 90 degrees.

Understanding line properties and angle relationships is essential in geometrical reasoning and solving problems involving figures and shapes.