Across
- 5. A three-dimensional geometric figure with parallel congruent bases. The bases can be shaped like any closed plane figure (not necessarily a circle) and must be oriented identically.
- 9. Two lines that intersect at right angles.
- 10. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.
- 13. A geometric figure with no indentations. Formally, a geometric figure is convex if every line segment connecting interior points is entirely contained within the figure's interior.
- 16. A three dimensional figure with a single base tapering to an apex. The base can be any simple closed curve.
- 19. The pair of angles opposite each other formed by two intersecting lines.
- 20. A basic element of geometry.
- 21. Two acute angles that add up to 90°. For example, 40° and 50° are complementary. In the diagram below, angles 1 and 2 are complementary.
- 22. Two angles in a plane which share a common vertex and a common side but do not overlap. Angles 1 and 2 below are adjacent angles.
- 26. zero in denominator for slope
- 27. Also called half-line. It is a straight line that extends from a point.
- 29. A plane figure bounded by three or more straight-line sides.
- 31. An angle that has measure less than 90°.
- 33. Exactly equal in size and shape.
- 35. The point halfway between two given points.
- 36. An additional geometric figure that is constructed to assist in solving a problem or producing a proof.
- 37. A three-dimensional figure bounded by plane polygonal faces. The point at which three or more faces meet is called a vertex. A line along which two faces meet is called an edge.
- 39. A straight line along which two faces of a solid meet.
- 43. A point at which the two rays of an angle meet or the intersection point of two sides of a plane figure.
- 44. Two things that are located or facing directly across. Two opposite numbers are the two numbers that are equidistant from the origin on a number line but in opposite directions from the origin.
- 46. A line segment between two points on the circle or sphere which passes through the center.
- 47. The distance from the center of a circle to any point on its circumference.
- 48. Two or more straight coplanar lines that do not intersect.
- 49. A unit of angle measure equal to of a complete revolution. There are 360 degrees in a circle.
Down
- 1. Lying on the same line.
- 2. A solid figure with one face a polygon (the base) and the other faces being triangles that all share the same vertex.
- 3. The length of the boundary around a shape or a figure.
- 4. general conclusion proposed to be proved upon the basis of certain given hypotheses or assumptions; or, a general conclusion that has been proved
- 6. A complete circular arc. Circumference also means the distance around the the outside of a circle.
- 7. One of the two pairs of equal angles formed when two straight lines intersect each other.
- 8. A shape or solid which has an indentation or "cave". Formally, a geometric figure is concave if there is at least one line segment connecting interior points which passes outside of the figure.
- 11. A geometric object that has no dimension and is used to indicate a location.
- 12. Also called non-coplanar lines. They are straight lines that are neither parallel, nor intersecting. They lie in different planes.
- 14. pair
- 15. Angle that measures larger than 90 degrees.
- 16. Lying in the same plane. For example, any set of three points in space are coplanar.
- 17. Two rays sharing a common endpoint. Angles are typically measured in degrees or radians.
- 18. The side of a right triangle opposite the right angle. Note: The hypotenuse is the longest side of a right triangle.
- 23. The surface included within a closed figure, measured by the number of square units needed to cover the surface.
- 24. pair of adjacent angles formed by intersecting lines. Angles 1 and 2 below are a linear pair. So are angles 2 and 4, angles 3 and 4, and angles 1 and 3. Linear pairs of angles are supplementary.
- 25. Two angles that add up to 180°.
- 28. 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.
- 30. One of the flat surfaces making up a polyhedron. Note: The faces of a polyhedron are all polygons.
- 32. On the coordinate plane, the pair of numbers giving the location of a point (ordered pair).
- 34. A polyhedron with two parallel, congruent polygons being its bases and all the other faces being parallelograms.
- 38. segment All points between two given points (including the given points themselves).
- 40. A perfect round solid in which all points on its surface are equidistant from a fixed point called the center.
- 41. A line segment, line, or plane that divides a geometric figure into two congruent halves.
- 42. Point B is between points A and C if it is on the line segment connecting A and C.
- 45. An initial proposition or statement that is generally accepted as true without proof (self-evident truth) and from which further statements, or theorems, can be derived by using logical deduction.