Basic Geometry (Source: think! Mathematics TB Sec 1B 8th Ed.)

The most basic geometrical object that is often marked by either a cross or a dot and which make up all the other geometrical objects is known as a ... .

• Point

• Line Segment

• Line

• Ray

• Plane

A geometrical object that is formed by joining two points A and B is known as a ... .

• Point

• Line Segment

• Line

• Ray

• Plane

The geometrical object that is made up of an infinite number of points between its two endpoints is known as a ... .

• Point

• Line Segment

• Line

• Ray

• Plane

The geometrical object that is formed when we extend a line segment indefinitely is known as a ... .

• Point

• Line Segment

• Line

• Ray

• Plane

The geometrical object that is a line with only one endpoint is known as a ... . An example of this geometrical object is light from a source such as the Sun or a lamp.

• Point

• Line Segment

• Line

• Ray

• Plane

The geometrical object that is a flat two-dimensional surface (i.e. has a length and a breadth, but no thickness) is known as a ... .

• Point

• Line Segment

• Line

• Ray

• Plane

Imagine three points, A, B, and C. If these three points lie on the same line, then we can say that these three points are ... .

• Collinear

• Intersecting

• Perpendicular

• Parallel

If two lines on a plane intersect at one point, then the two lines can be rightly described as ... lines.

• Perpendicular

• Parallel

• Collinear

• Intersecting

If two intersecting lines intersect each other at right angles, then these two lines can be best described as ... lines.

• Collinear

• Parallel

• Perpendicular

• Intersecting

If two lines do not intersect at any point, then these two lines can be rightly described as ... lines.

• Collinear

• Parallel

• Perpendicular

• Intersecting