Lines Chapter Notes | Math Olympiad for Class 2 PDF Download

What is a Line?

• A line can be defined as a straight set of points that extend in opposite directions
• It has no ends in both directions(infinite)
• It has no thickness
• it is one-dimensional

Points, Lines and Angles

• Points, lines and angles are the basics of geometry which collectively define the shapes of an object. 
• An example of a combination of points, lines and angles is a rectangle which has four vertices defined by a point, four sides shown by lines and four angles equal to 90 degrees.
• Similarly, we can define other shapes such as rhombus, parallelogram, square, kite, cube, cuboid, etc using these three primary figures.

What is a Line segment?

• A line segment is part of a line which has defined endpoints
• It has a beginning point and an ending point

What is a Ray?

A ray is a part of a line that has one endpoint (i.e. starting point) and it extends in one direction endlessly.

Types of Line

1. Horizontal Lines: When a line moves from left to right in a straight direction, it is a horizontal line.

2. Vertical Lines: When a line runs from top to bottom in a straight direction, it is a vertical line.

2. Parallel Lines: When two straight lines don’t meet or intersect at any point, even at infinity, then they are parallel to each other.