1. Seventh Grade Math Vocabulary

2. Acute Triangle A triangle whose angles all measure less than 90° Examples Golden acute triangle 36 72

3. Area of Complex Shapes The number of square units needed to cover a given surface Divide the shape into shapes whose areas are easy to calculate and then add (or subtract) to find the area of the given shape Example The area of the given shape is: 1500 + 3000 = 4500 square units 1500 3000

4. Area of Irregular shapes The number of square units needed to cover a given surface Count the number of whole square units and combine partial square units together to get a total area Examples The area is approximately 10 units² The area is approximately 32 units²

5. Box & Whisker Plot A graph that shows how far apart and how evenly data are distributed Example 68 is the median, 52 is the lower quartile, 87 is the upper quartile 18 27 34 52 54 59 61 68 78 82 85 87 91 93 100

6. Equiangular Triangle A triangle with three congruent angles (and also three congruent sides)

7. Equilateral Triangle A triangle with three congruent sides (and also three congruent angles) Examples

8. Exponent Notation A number written with a base an exponent Examples Base Exponent = 64

9. Exponent The number that indicates how many times the base is used as a factor Examples base

10. Inequalities (number line) The graph of a mathematical sentence showing the relationship between quantities that are not equal, using,, or Examples

11. Integer The set of whole numbers and their opposites Examples Integers Use the remaining integers to Make every circle add to zero

12. Isosceles Triangle A triangle with (at least) two congruent sides The two congruent sides are called legs The third side is the base The angle formed by the legs is the vertex angle Examples: leg base Vertex angle

13. Linear Equation An equation that can be represented as a line on the coordinate plane Examples

14. Multi-step Equations An equation where you have to do more than one operation in order to find the solutions Examples

15. Obtuse Triangle A triangle containing exactly one obtuse angle (an angle greater than 90 degrees)

16. Opposite Two numbers (represented by points on the number line) that are the same distance from zero and are on opposite sides of zero Examples The opposite of 0 is 0 4 and -4 are opposites 8 and -8 are opposites

17. Percents (above 100, below 1) A percent is a ratio that compares a number to 100 Percent means “per hundred” Examples 1 1 /10 110% +1. A percent above 100 means you have more than a whole :

18. Pi (approximation) The ratio of the circumference of a circle to the length of its diameter Examples

19. Rational Numbers Any number that can be expressed as a ratio where a and b are integers and b 0 Decimals representing rational numbers either terminate or repeat Examples Real Numbers Rational Numbers Irrational numbers Integers Whole numbers Natural numbers

20. Regular Polygon A polygon in which all sides and all angles are congruent Examples Equilateral triangle square pentagon hexagon heptagon octagon nonagon decagon

21. Right Triangle A triangle with exactly one right angle Examples

22. Scale Factor The common ratio for pairs of corresponding sides of similar figures The ratio used to enlarge or reduce objects Examples The scale factor is 2 4 6 3 8 5 10 Models: if a car is 204” in length and the length of a model of the car is 12” long, the scale factor would be

23. Scalene Triangle A triangle with no congruent sides Its sides are all different in length (Its angles are also all different in size) Examples 10 14 20

24. Scatter Plots A graph of plotted points that attempts to show a relationship (correlation) between two variables Examples This data shows a positive correlation: As x increases, so does y This data shows a negative correlation: As x increases, y decreases This data shows no correlation

25. Similarity Figures that have the same shape, but not necessarily the same size Examples Similar Similar polygons have congruent corresponding angles Similar polygons have corresponding sides that form equivalent ratios (proportions) 2 5 4 10