Across
- 2. The point halfway between two given points.
- 7. The distance around the outside of a plane figure. For a polygon, it is the sum of the lengths of the sides.
- 9. A closed plane figure for which all sides are line segments. The name of it describes the number of sides.
- 10. On the coordinate plane, the pair of numbers giving the location of a point (ordered pair). In n-dimensional shape, a sequence of n numbers written in parentheses.
- 11. Lying on the same line.
- 12. An additional geometric figure that is constructed to assist in solving a problem or producing a proof.
- 14. The side of a right triangle opposite the right angle.
- 17. Two acute angles that add up to 90°.
- 21. A planar surface of a solid figure.
- 24. A corner point of a geometric figures. For a polygon, they are where adjacent sides meet. For an angle, it is where the two rays making up the angle meet.
- 25. An angle that measures 90° or /2 radians. It is the angle between two perpendicular lines such as the corner of a square or two perpendicular planes such as the wall and the ground.
- 26. A shape or solid which has an indentation or "cave". Formally, a geometric figure has at least one line segment connecting interior points which passes outside of the figure.
- 29. A three-dimensional geometric figure with parallel congruent bases. The bases can be shaped like any closed plane figures (not necessarily a circle) and must be oriented identically.
- 31. An angle that has measure more than 90° and less than 180°.
- 34. Exactly equal in size and shape.
- 36. A three dimensional solid consisting of all points equidistant from a given point.
- 37. A flat surface extending in all directions.
- 39. Two rays sharing a common endpoint.
- 40. A solid with parallel congruent bases which are both polygons. The bases must be oriented identically.
- 41. A part of a line starting at a particular point and extending infinitely in one direction.
- 42. The geometric figure formed by two points. A straight path connecting two points and extending beyond the points in both directions.
- 45. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.
- 46. Two angles that add up to 180°.
- 48. A line segment between the center and a point on the circle or sphere.
Down
- 1. A line segment, line, or plane that divides a geometric figure into two congruent halves.
- 3. The geometric figure formed at the intersection of two distinct lines.
- 4. All points between two given points (including the given points themselves).
- 5. A pair of adjacent angles formed by intersecting lines.
- 6. When two lines intersect four angles are formed and the two angles across from each other.
- 8. Points or lines that all lie in the same plane.
- 12. A complete circular arc. The distance around the the outside of a circle.
- 13. A three dimensional figure with a single base tapering to an apex. The base can be any simple closed curve.
- 15. Also called non-coplanar lines. They are straight lines that are neither parallel, nor intersecting.
- 16. a term or word that does not require any explanation or description.
- 18. two rays with a common end point that form a line.
- 19. A solid with no curved surfaces or edges. All faces are polygons and all edges are line segments.
- 20. Two angles in a plane which share a common vertex and a common side but do not overlap.
- 22. At a 90° angle.
- 23. An angle that has measure less than 90°.
- 27. A geometric figure with no indentations.
- 28. Angles opposite one another at the intersection of two lines.
- 30. A line segment between two points on the circle or sphere which passes through the center.
- 32. point B is between points A and C if it is on the line segment connecting A and C.
- 33. A unit of angle measures equal to of a complete revolution.
- 35. A straight line along which two faces of a solid meet.
- 38. the amount of space in the boundary of a flat object.
- 43. An assertion that can be proved true using the rules of logic.
- 44. Two distinct coplanar that do not intersect.
- 45. A polyhedron with a polygonal base and lateral faces that taper to an apex.
- 47. A statement accepted as true without proof.