| A | B |
|---|
| Isosceles triangle | A triangle with two congruent sides. (two sides are equal) |
| Leg | A side of a right triangle that is not the hypotenuse, also a side of an isosceles triangle that is not the base. |
| Least | Smallest in size or degree. |
| Maximum | The largest in size or degree. |
| Minimum | The least of a set of numbers or the least quantity possible. |
| Mean | The average of a group of numbers. |
| Range | The difference between the greatest and the least numbers in a set of data. An estimate consisting of a greater and lesser possible answer. |
| Right angle | An angle with a measure of 90 degrees. |
| Right triangle | A triangle with one right angle. |
| Scalene triangle | A triangle with no congruent sides. (none of the sides are equal) |
| Similar | Figures with the same shape but not necessarily the same size. |
| Symmetric | A plane figure that can be folded in half so the two halves match. |
| Factor | A number that divides evenly into a given second number is a factor of that number. |
| Element | A line segment contained in the surface of a cone or cylinder. |
| Equilateral triangle | A triangle with three congruent sides. (all three sides are equal) |
| Obtuse angles | An angle with a measure greater than 90 degrees and less than 180 degrees. |
| Hypotenuse | The side of a right-angled triangle that is opposite the right angle. |
| Perimeter | The sum of the lengths of the sides of a polygon. |
| Perpendicular | lines that intersect to form right angles. |
| Polygon | A closed plane figure made by line segments. |
| Prime Numbers | A whole number, greater than 1, that has exactly two factors itself and 1. |
| Probability | A number from 0 to 1 that tells how likely it is that a given event will occur. The closer to 1 the more likely the event is to occur. The closer to 0 the less likely it is to occur. |
| Quadrilateral | A four sided polygon. (four sides and four angles.) |
| Median | The middle number of a group of numbers when the numbers are listed in order. |
| Mode | The number that occurs most often in a set of data. |
| Multiple | The number that is the product of a number and a whole number. |
| Negative numbers | A number less than 0, such as -5 or -10 |
| Parallel | Lines in a plane that never meet. |
| Parallelogram | A quadrilateral with opposite sides parallel and congruent. (sides are the same length) |
| Pattern | A general idea by which things can be arranged or events can happen in an organized way. |
| Tessellation | A repetitive pattern of polygons with no holes and no overlaps similar to a mosaic which uses one or more geometric shapes. |
| Trapezoid | A quadrilateral with one pair of parallel sides |
| Tree Diagram | An organized way to list all possible outcomes of an experiment. |
| Triangle | A three sided polygon. |
| Venn Diagram | Intersecting circles used to show the relationships between sets. |
| Volume | A number given in cubic units that indicates the size of the inside of a space figure. |
| Acute Angle | An angle with a measure less than 90 degrees. |
| Area | A number given in square units that indicates the size of the inside of a plane figure. |
| Composite Numbers | A whole number, greater than 0, that has more than two factors. |
| Congruent | Figures with the same "size and shape" |
| Expanded number | A way to write a number to show the value of each digit. (12,764 =10,000 +2000+700+60+4) |
