| A | B |
|---|
| acute angle | an angle that measures less than 90 degrees but more than 0 degrees |
| angle | the figure formed when two rays meet at a common endpoint called a vertex |
| line | a straight path in a plane, extending in both directions with no endpoints |
| line segment | a part of a line between two endpoints |
| obtuse angle | an angle whose measure is greater than 90 degrees but less than 180 degrees |
| parallel | lines in the same plane that do not intersect |
| point | a position in space |
| ray | a part of a line that begins at one endpoint and extends forever in only one direction |
| right angle | an angle made when two line segments (or rays) meet to form a square corner |
| straight angle | an angle that measures 180 degrees |
| equation | a mathematical statement that two expressions are equal |
| greater than | the symbol ">" is used to show a number is larger than another number |
| horizontal | parallel to the horizon, going east to west, or left to right |
| less than | the symbol "<" used to compare two numbers with the lesser number given first |
| sum | the total made by adding two or more numbers together |
| total | the sum or whole amount |
| vertical | at right angles to the horizon, north to south, up an down, top to bottom |
| addends | numbers that are added to find the sum |
| associative property of addition | the property that states when the grouping of addends is changed, the sum is the same |
| difference | the amount that remains after one number has been subtracted from another |
