# IMO Class 4 Chapter 6: Geometrical Concepts

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## IMO Class 4 Chapter 6: Geometrical Concepts Detailed Notes

Fundamental Geometrical Ideas

• 2D Shapes
• 3D Shapes

Geometry (Point, Line, Ray, Line Segment)

### Making Shapes with a Net

A net is a flat, two-dimensional pattern that can be folded into a three-dimensional shape; when the three-dimensional shape is undone, the net is revealed. There could be several nets in a solid.

Points to keep in mind:

• The same number of faces exists in both the solid and its net.
• Consider how the net might be folded to take on the specified shape.

## Fundamentals of Geometry

Point

A point is a very tiny dot that can be made with a pencil. They are neither large nor small. To name a point, use a capital letter.

See the illustration below. Point O is this.

Line Segment

A line segment is a straight path that connects two points.

A line segment is demonstrated in the image below. Line segment AB refers to this section of the line.

A line is a segment of a line that never ends on either side. It doesnâ€™t have a start or finish.

Ray

A ray is a segment of a line that never ends and travels exclusively in one direction.

Line

A line has length but no width, making it a one-dimensional figure. A line is made up of a collection of points that can be extended indefinitely in opposing directions. Two points in a two-dimensional plane determine it. Collinear points are two points that are located on the same line.

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IMO Class 1 chapter 1

IMO Class 1 chapter 2

IMO Class 2 chapter 3

IMO Class 3 Chapter 5

IMO Class 4 chapter 4

IMO Class 4 chapter 5

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