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Across 3. a number that indicates the operation of repeated multiplication 6. the distance around a circle 8. set of numbers that are known as the counting numbers and include 1, 2, 3, ... 9. a quadrilateral with four equal sides and four 90 degree angles 12. a number that cannot be expressed as the ratio of two integers 13. the answer to a division problem 14. a three-sided polygon. 15. the result of two numbers being multiplied together 16. a property defined as: a(b + c) = ab + ac 18. the set of numbers containing zero, the natural numbers, and all the negatives of the natural numbers 19. a connected set of points in a plane that are a fixed distance from a given point, called the center 20. two lines that are in the same plane and never intersect 22. the line segment joining two points on a circle and passing through the center of the circle

Down 1. a fraction, or ratio, in which the denominator is assumed to be 100, the symbol % is used 2. a solid figure with six square faces 4. two lines are perpendicular if the angle between them is 90 degrees 5. the union of two rays with a common endpoint, called the vertex 7. a mathematical statement that says that two expressions have the same value; any number sentence with an = 9. the value of a variable that makes an equation true 10. set of numbers that include 0, 1, 2, 3, .... 11. a number used to name a part of a group or a whole. the number below the bar is the denominator, and the number above the bar is the numerator 15. the sum of the lengths of the sides of a polygon 17. set of numbers that include the combined set of rational numbers and irrational numbers 21. the number of square units that cover a shape or figure