Objectives: Become familiar with spatial vocabulary Be able to identify points, lines, planes from a given picture. Also, identify intersections of these objects.
A point is simply a location in space.
A point is so small that it does not take up any space (zero volume).
We label points with capital letters.
When you draw a point on your paper, what are you really doing? You are marking off a location in space.
Draw and label a point in the space below:
We know what a line looks like , but in Geometry a line is and infinite row of points.
It has no beginning and no end.
2 points are collinear if they lay on the same line.
Draw a picture of a line, label it “r”, containing 2 collinear points, label them “P and Q”:
A plane is a 2 – dimensional “slice” of space that can contain points and lines.
It is always FLAT.
Draw a picture of a plane and label it “W”: