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Across 3. the amount of space a 3-D object can hold 7. of the same size and shape 8. an angle whose vertex is the center of the circle 9. half of a sphere 11. the distance from the center to the circle 13. a reversed conditional; 14. a four-sided polygon 15. a triangle with one right angle 16. An infinitely small location in space marked by a specific coordinate 17. the distance around a 2-D figure 18. a collection of points extending along one dimension 19. the polygon shapes making up the sides of a polyhedron 21. lines that are not parallel and do not intersect in space 22. an angle measuring between 90 and 180 degrees 24. a quadrilateral with two pair of parallel sides 25. a covering of a plane with congruent copies of the same region with no holes or overlaps 26. a two-dimensional sheet defined by any three points 27. a 2-D figure; the set of all points at a given distance from the center 28. a ray that is in the interior of an angle and forms two equal angles with the sides of that angle 29. congruent angles formed by two parallel lines cut by a transversal; positioned on matching "corners" of intersections 30. the distance between an arc's endpoints along the path of the circle 32. a line that intersects 2 others 38. the top and bottom parallel polygonal faces 39. a triangle with one obtuse angle 40. two or more angles that sum to 90 degrees 41. a line that crosses a pair of parallel lines 42. two or more angles that sum to 180 degrees 43. an arc whose endpoints form an angle over 180 degrees with the center of the circle 47. an angle measuring between zero and 90 degrees 48. a set of three numbers that can be side lengths of a right triangle 49. a triangle with three sides of different lengths 50. the segment connecting the vertex of an angle in a triangle to the midpoint of the side opposite it 51. congruent angles formed by two parallel lines cut by a transversal; located on opposite sides of the transversal outside the parallel lines 52. congruent opposite angles formed by two intersecting lines

Down 1. an educated guess or opinion; a hypothesis 2. a conditional and its converse where the converse is also true; uses the words if and only if 3. the angle formed by the equilateral sides of an isoscoles triangle 4. a quadrilateral with all congruent sides and all congruent angles 5. meeting at a 90 degree angle 6. a statement that tells if one thing happens, another will follow 10. the perimeter of a circle 12. lines that never intersect in a plane 13. a line segment connecting any two points of the interior does not go outside the polygon; none of the interior angles is greater than 180 degrees 20. a type of conditional; if not q, then not p; 23. congruent angles formed by two parallel lines cut by a transversal; located on opposite sides of the transversal between the parallel lines 26. the bisector of a segment perpendicular to it 27. the point in the middle of the circle or sphere 29. a line segment connecting two points of the interior can go outside the polygon; at least one of the interior angles is greater than 180 degrees 31. a statement assumed to be true without proof; 33. a triangle with three acute angles 34. the measure of the tilt of a line; rise over run 35. a form of conditional; if not p, then not q 36. a triangle with two congruent legs 37. an angle measuring exactly 90 degrees 44. the height of a 2-D or 3-D geometric figure measured perpendicularly from the center of the top face or point to the center of the base 45. in the same line 46. an arc whose endpoints form an angle less than 180 degrees with the center of the circle;