| A | B |
|---|
| obtuse angle | an angle that measures greater than 90 degrees and less than 180 degrees |
| acute angle | an angle that measures greater than 0 degrees and less than 90 degrees |
| prime number | a whole number greater than 1 that has exactly two factors, itself and 1 |
| variable | a letter or symbol used to represent an unknown number |
| constant | a specific number whose value does not change |
| substitute | to replace a variable with a number in an algebraic expression |
| solution | the value of the variable that makes the equation true |
| inverse operations | operations that undo each other |
| equation | a mathematical sentence that contains an equal sign |
| commutative property | 5+4=4+5 and 2 x 4 = 4 x 2 |
| associative property | (3+4)+5=3+(4+5) and (2x4)x3=2x(4x3) |
| distributive property | 2(a+3) = 2a + 6 |
| identity property | 9+0=9 and 9x1=9 |
| inequality | a mathematical sentence that shows the relationship between quantities that are not equal; example: x+2<5 |
| less than | < |
| greater than | > |
| equilateral triangle | a triangle with three equal sides and three equal angles |
| evaluate | to find the value of a numeric or algebraic expression |
| isosceles triangle | a triangle with two equal sides and two equal angles |
| scalene triangle | a triangle that has no equal sides and no equal angles |
| 180 degrees | the sum of the angles in a triangle |
| right angle | an angle that measures exactly 90 degrees |
| straight angle | an angle that measures exactly 180 degrees |
