| A | B |
|---|
| acute angle | angle measuring less than 90 degrees |
| angle | a figure formed by two rays |
| centimeter | 100 of these = a meter |
| clockwise rotation | the direction the hands move on a clock |
| concave polygon | a polygon where one vertex is pushed inward |
| concentric circles | circles that have the same center |
| convex polygon | all vertices appear to be pushed outward |
| counterclockwise rotation | opposite direction the hands move on a clock |
| counting numbers | the numbers used to count things |
| decimeter | 1/10 of a meter |
| denominator | the bottom number of a fraction |
| diameter | line segment that passes through the center of a circle |
| dividend | the number in division that is being divided |
| divisor | the number that divides another |
| endpoint | a point at the end of a line segment or ray |
| equilateral triangle | a triangle with 3 equal sides |
| equivalent fractions | fractions that name the same number |
| equivalent names | different ways of naming the same number |
| estimate | an answer close to the exact answer |
| expression | a mathematical phrase, equation |
| face | a flat surface on a 3-D figure |
| factor | a number being multiplied |
| flip | reflection |
| heptagon | 7 sided figure |
| hexagon | 6 sided polygon |
| intersect | two lines crossing |
| isosceles triangle | a triangle with 2 sides equal |
| line | a straight path that extends forever in 2 directions |
| line segment | a part of a line |
| maximum | the largest amount |
| median | the middle value |
| minimum | the smallest amount |
| mixed number | a whole number and a fraction |
| mode | the value that occurs most often |
| nonagon | 9 sided polygon |
| numerator | the top number in a fraction |
| octagon | 8 sided polygon |
| obtuse angle | angle larger than a right angle |
| parallel lines | lines that would never cross |
| pentagon | 5 sided polygon |
| perimeter | the distance around a polygon |
| perpendicular | two lines that intersect of form a right angle |
| product | the answer in multiplication |
| quadrilateral | 4 sided polygon |
| quotient | the answer in division |
| range | difference between maximum and minimum |
| ray | a part of a line that travels in one direction |
| rotation | turn |
| remainder | the amount left over |
| right angle | a 90 degree angle |
| translation | slide |
| square | a rectangle with 4 equal sides |
| square unit | a unit used to measure area |
| straight angle | a 180 degree angle |
| vertex | the point where 2 sides meet |
| variable | a letter that represents a number |
| volume | amount of space occupied by a 3D shape |
| congruent | exact same size and shape |
| symmetrical | 2 halves of a figure match exactly |
| commutative | 9 x 3 = 3 x 9 |
