perimeter
The distance around a figure
Example:
2 cm + 3 cm + 3 cm = 8 cm
The perimeter of this figure is 8 centimeters.
perpendicular lines
| Two lines that intersect to form four right angles | |
| Example: |
 |
plane
| A flat surface that extends without end in all directions | |
| Example: |
 |
| Planes are named by three points in the plane. | |
plane figure
A figure which lies in a plane
Examples:
point
An exact location in space, usually
represented by a dot
Example:
point A
point symmetry
When a figure can be turned half way about
a central point and still look the same
Example:
