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Across 7. the distance between two numbers, points, etc., expressed as a positive value 9. 4 sided closed polygon 11. relationship of lines that intersect at 90 degrees to each other 13. the formula used to find the distance between two points (2 words) 14. segment drawn between any two midpoints of a triangle's sides 15. the center of a triangle formed by the perpendicular bisectors 18. quadrilateral whose opposite sides are congruent and parallel 21. the vertices of one polygon lie on the sides of another 22. a quadrilateral whose opposite sides are congruent and parallel and has 90 degree angles 24. name of the point at coordinates (0,0) 25. relationship of lines that are the same distance apart and never intersect 26. the side opposite the right angle of a right triangle, always the longest side 27. vertical axis of a coordinate plane (2 words)

Down 1. expression involving the radicand symbol 2. horizontal axis of a coordinate plane (2 words) 3. the center of a triangle formed by the altitudes 4. the steepness of a line 5. one of two sides that make the right angle of a right triangle 6. the equation form of a line using the slope and the y-intercept of a line (two words) (2 words) 8. a triangle with at least two congruent sides 10. Pythagorea's idea for a right triangle (two words) (2 words) 12. the equation form of a line using a point and the slope of the line (two words) (2 words) 16. the center of a triangle formed by the angle bisectors 17. 3 sided closed polygon 19. a triangle with 3 congruent sides 20. the center of a triangle formed by the medians 23. the halfway point between two points