Introduction to Geometry Mrs. Gilleran A. Gilleran.

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Presentation transcript:

Introduction to Geometry Mrs. Gilleran A. Gilleran

What does Geometry Mean? Gee – I’m – A- Tree A. Gilleran This Photo by Unknown Author is licensed under CC BY-NC-ND

line Line Segment Points/Planes Collinear Points Rays What you will learn

Geometry Relates to shape, size, position of figures, and the properties of space. A. Gilleran

What is the point? On the right we have 2 points, labelled A and B. There is only one straight line that passes through the points A and B. We call that the line AB The line AB goes on forever in both directions. A B A. Gilleran

The line can be named with a single lowercase letter like l, m, or n. A. Gilleran

Line Segment A line beginning at the point A and ending at the point B is called a line segment. It is wrote as [AB] A B A. Gilleran

Spot the difference between Line Segment and line A. Gilleran

Rays A line that has a start point but no end point. A line that starts at A and continues on through B is called the ray [AB Rays are sometimes called half-lines A. Gilleran

Collinear Points If the points are in the same straight line They are called collinear The points C, A, B and D are collinear A. Gilleran

The plane The flat surface on which points and lines are shown is called a plane. A plane contains an infinite number of points. This diagram shows five points drawn on the plane of the page. The points D, A and E are collinear A. Gilleran

Summary Points Line AB Line Segment [AB] Ray [AB Collinear Points Plane A. Gilleran