| A | B |
|---|
| network | a diagram made up of branches or lines connecting points, nodes, junctions or vertices |
| node | a junction, vertex or point where 2 or more lines come together ot where a single line starts |
| vertex | a junction, node or point where 2 or more lines come together ot where a single line starts |
| traverse a network | to pass or travel over a network without going over any line twice |
| even vertex | a vertex or node with an even number of lines coming into it |
| odd vertex | a vertex or node with an odd number of lines coming into it |
| decade | a period of 10 years |
| century | a period of 100 years |
| bi-centennial | a period of 200 years |
| mirror image | the way an image appears as if seen in a mirror (reversed) |
| line of symmetry | a line dividing a 2 dimensional shape into 2 parts that are mirror images |
| line symmetry | when a shape is a mirror image of another shape by flipping |
| rotation | turning a geometric shape around a center point |
| rotational symmetry | rotating a geometric shape around a center point the same number of degrees |
| leap year | the addition of an extra day on the calendar in February every 4 years |
