This is where it all begins: basic shapes, lines, and angles.
Read on and let us take you on a magical geometry tour...
Name | Description | Example |
Point | - A single location.
- Usually drawn as a dot.
- It is "dimensionless".
- Labeled as Point P. You used these when playing Connect the Dots.
| |
Line | - A straight path passing through at least two points.
- Extends in both directions forever.
- Labeled as
- Think of this as a highway that never ends.
| |
Line Segment | - A portion of a line.
- It has limits at each end.
- Labeled as
- You've drawn these since you were 1½!
| |
Ray | - A straight path with one terminal point and extending indefinitely in the other direction.
- Labeled as Make sure to start with the terminal point and extend past the other point.
- Rays are an easy image. Picture the sun as a terminal point and its rays extending indefinitely into space.
| |
Plane | - A flat surface without boundaries.
- Labeled by naming three nonlinear points on the plane, Plane GHI.
- Planes are somewhat difficult to imagine. It's like a piece of paper that extends in every direction forever.
| |
Parallel Lines | - Lines that lie on the same plane and never intersect.
- Labeled as
- Look at a piece of lined paper. All the horizontal lines are parallel to each other.
| |
Perpendicular Lines | - Lines that intersect at a 90° angle.
- Labeled as
- On that same lined paper the vertical margin lines are perpendicular to the horizontal ones.
| |
Basic Shapes & Angles Practice:
Two parallel lines | |
Two sets of perpendicular lines | |
Many ways to name the plane | Plane EBF. This plane can be named numerous ways as long as you use three points that are not in a line. |
There are many rays in this picture, here are three for example | |
What is the intersection of two unique, non-parallel lines?
Hint
imagine two straws meeting
What is the intersection of two unique, non-parallel planes?
Hint
imagine two pieces of paper meeting
How many dimensions does a plane have?
Hint
there is width and length