| A | B |
|---|
| altitude | also called height |
| alternate interior angles | angles formed by two lines and transversal whose interiors are between the two lines and on different sides of the transversal |
| angle bisector | cuts an angle in half |
| antecedent | the if clause of a conditional |
| area | the inside of a polygon |
| base angles | two angles whose vertices are the endpoints of a base of a triangle |
| binomial | an algebraic expression with exactly two terms |
| central angle | an angle whose vertex is the center of the circle |
| chord | a segment whose endpoints are on a given circle |
| circumference | the perimeter of a circle |
| collinear points | points that lie on the same line |
| complementary angles | two angles whose sum is 90 |
| converse | switch the antecedent and consequent |
| conditional | a statement of the form if...then |
| conjecture | an educated guess or opinion |
| consequent | the then clause of a conditional |
| corresponding angles | a pair of angles in similar locations when two lines are intersected by a transversal |
| cosine | adjacent/hypotenuse |
| sine | opposite/hypotenuse |
| tangent | opposite/adjacent |
| cube | a box whose dimensions are all equal |
| diagonal | connects nonconsecutive vertices of a polygon |
| equidistant | at the same distance |
| even node | the endpoint has an even number of arcs |
| odd node | the endpoint has an odd number of arcs |
| expansion | a size change with a magnitude greater than one |
| glide reflection | reflection and a translation |
| hypotenuse | the longest side of a right triangle |
| horizontal line | a line with an equation y = k |
| vertical line | a line with an equation x = h |
| inverse | negating the antecedent and consequent |
| lateral area | the sum of the areas of the lateral faces |
| leg | either side of a right triangle |
| linear pair | two adjacent angles whose noncommon sides are opposite rays |
| mean | the sum of a set of numbers divided by the number of numbers in the set |
| median of a triangle | the segment connecting a vertex of the triangle to the midpoint of the opposite side |
| null set | the set with no elements |
| oblique line | a line that is neither horizontal nor vertical |
| perimeter | the length of the boundary of a closed region |
| pixel | a dot on a computer screen |
| semicircle | half of a circle |
| supplementary angles | two angles whose sum is 180 |
| slant height | the length of the lateral edge |
| slope | the change in y divided by the change in x |
| straight angle | an angle whose measure is 180 |
| vertical angles | two nonstraight and nonzero angles whose sides form two lines |
