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Across 4. A parallelogram with four equal sides. 6. The total number of successful events divided by the total number of possible events. 7. A transformation, or change in position, resulting from a slide with no turn. 9. A equation that states a rule or a fact. 10. A triangle with three unequal sides. 11. A triangle with at least two equal sides. 14. Part of a line, with one endpoint, and extending to infinity in one direction. 17. The side opposite the right angle in a right triangle. 18. A letter used to represent a number value in an expression or an equation. 19. A flat surface that stretches into infinity. 21. A triangle that has three equal sides. 23. The horizontal axis in a coordinate plane. 24. The steepness of a line expressed as a ratio, using any two points on the line. 25. A triangle that contains a right angle.

Down 1. The ratio of the circumference of a circle to its diameter. 2. Two angles whose sum is 90 degrees. 3. A triangle with an obtuse angle. 5. Two angles are supplementary if their sum is 180 degrees. 6. A squared + B squared = C squared 8. A straight set of points that extends into infinity in both directions. 12. For a three-dimensional figure, the sum of the areas of all the faces. 13. A triangle each of whose angles measures less than 90 degrees. 15. A polygon with 4 sides. 16. A point on a line segment that divides the segment into two congruent segments. 20. The vertical axis in a coordinate system. 22. A three-sided polygon.