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Across 1. An angle that measures less than 90 5. A transformation of a figure that flips the figure across a line 7. The imaginary "mirror" in line symmetry 10. A straight path that extends without end in opposite directions 11. A quadrilateral with exactly one pair of parallel sides 12. A triangle with all angles measuring less than 90 16. Lines that lie in different planes that are neither parallel nor intersecting 17. On an angle or polygon, the point where two sides intersect 19. Two angles whose measures add to 90 21. A triangle with at least two congruent sides 22. A rectangle with four congruent sides 23. A parallelogram with four right angles 26. A polygon with congruent sides and angles 29. A transformation in which a figure is turned around a point 31. Lines that intersect to form right angles 32. A four-sided polygon 33. A triangle containing one obtuse angle 34. A movement (slide) of a figure along a straight line 35. A figure has this if one half is a mirror-image of the other half 36. And angle that measures 90 38. Lines in a plane that do not intersect 39. A part of a line between two endpoints 40. A change in the size or position of a figure

Down 2. Angles in the same plane that have a common vertex and a common side 3. A line that a figure is flipped across to create a mirror image of the original figure 4. A parallelogram with all sides congruent 6. An exact location in space 8. Two angles whose measures have a sum of 180 9. A quadrilateral with two pairs of parallel sides 13. A triangle with three congruent sides 14. An angle whose measure is greater than 90 but less than 180 15. A triangle with no congruent sides 18. An angle that measures 180 20. A flat surface that extends forever 24. A pair of opposite congruent angles formed by intersecting lines 25. A triangle containing a right angle 27. Having the same size and shape 28. A closed plane figure formed by three or more line segments that intersect only at their endpoints 30. A part of a line that starts at one endpoint and extends forever 37. A figure formed by two rays with a common endpoint called the vertex