| A | B |
|---|
| abscissa | x-coordinate on graph |
| absolute value | distance from zero to the number |
| acute angle | positive angle less than 90 degrees |
| additive inverse | sum of a number and its additive inverse is zero |
| adjacent angles | angles that share the same vertex and have one side in common |
| algorithm | sequence of instructions that tells how to accomplish a task |
| alternative interior angles | formed by a transversal cutting two lines |
| altitude height | distance from the base of a plane figure to the farthest point |
| area | for a two-dimensional figure measures how much of a plane it fills up |
| arithmetic mean | sum of a group of numbers divided by number of numbers |
| arithmetic sequence | sequence of n numbers of form a, a+b, a+2b, a+3b,...,a+(n-1)b |
