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Across 2. A quadrilateral with two pairs of adjacent sides that are congruent. 4. Lying on the same line. 7. A 90° angle. 10. A trapezoid with base angles that are the same. 11. A line segment between two points on the circle or sphere which passes through the center. 12. The locus of all points that are a fixed distance from a given point. 13. A quadrilateral with two pairs of parallel sides. 14. The geometric figure formed at the intersection of two distinct lines. 17. When lines intersect and form a 90° angle they are this. 18. Two features that are situated the same way in different objects. 20. A polygon with five sides. 23. Exactly equal in size and shape. 24. A triangle which has an obtuse angle as one of its interior angles. 26. A polygon with four sides. 27. A triangle with three congruent sides. 28. On the most basic level, this term refers to the measurements describing the size of an object. 29. The distance around the the outside of a circle. 30. Perfectly flat and level. 33. Two distinct coplanar lines that do not intersect. 38. A parallelogram with four congruent sides. 40. The side of a right triangle opposite the right angle. 41. A polygon with nine sides. 42. A flat surface extending in all directions. 43. The point halfway between two given points. 44. An angle that has measure less than 90°. 45. Another word for average. 46. The bottom of a figure. 47. Next to; neighboring. 48. On the coordinate plane, the point (0, 0). 49. An expression used to calculate a desired result.

Down 1. Two acute angles that add up to 90°. 3. To figure out or compute. 5. Two rays sharing a common endpoint. 6. The line perpendicular to a segment passing through the segment's midpoint. 8. A triangle with two sides that are the same length. 9. Lying in the same plane. 15. All points between two given points (including the given points themselves). 16. A geometric figure with no indentations. 19. A line or ray that divides an angle in half. 21. An angle that has measure more than 90° and less than 180°. 22. A shape or solid which has an indentation or "cave". 25. The plane formed by a horizontal axis and a vertical axis, often labeled the x-axis and y-axis, respectively. 30. A polygon with six sides. 31. The straight path connecting two points and extending beyond the points in both directions. 32. A polygon with eight sides. 34. The first coordinate in an ordered pair. 35. The four sections into which the x-y plane is divided by the x- and y-axes. 36. The distance around the outside of a plane figure. 37. A closed plane figure for which all sides are line segments. 39. A polygon with seven sides.