Across
- 5. A flat surface extending in all directions. Any three noncollinear points lie on one and only one plane. So do any two distinct intersecting lines. A plane is a two-dimensional figure.
- 8. rays Two rays with a common endpoint that point in opposite directions and form a straight line.
- 9. Point B is between points A and C if it is on the line segment connecting A and C.
- 11. angle An angle that has measure more than 90° and less than 180°.
- 14. pair Two angles that are adjacent and supplementary
- 15. Lying in the same plane.
- 17. Exactly equal in size and shape.
- 19. the act or art of constructing.
- 21. A unit of measure used to measure the magnitude of an angle, equal in magnitude to 1/360 of a complete revolution.
- 26. The side opposite the right angle in a right triangle.
- 27. Two acute angles that add up to 90°.
- 28. Two lines that intersect at right angles.
- 29. angle An angle that has measure less than 90°.
- 31. Two angles that add up to 180°.
- 36. Two or more straight coplanar lines that do not intersect.
- 38. A line segment that passes through the center of a circle and has its two endpoints on the circle. It also represents the length of such a line segment.
- 40. One of the flat surfaces making up a polyhedron.
- 41. Two rays sharing a common endpoint. Angles are typically measured in degrees or radians.
- 42. A space figure with two parallel polygonal bases that are the same shape and the same size.
- 43. A closed plane figure for which all sides are line segments. The name of a polygon describes the number of sides. A polygon which has all sides mutually congruent and all angles mutually congruent is called a regular polygon.
- 44. The geometric figure formed at the intersection of two distinct lines.
- 45. angle An angle that measures 90°
Down
- 1. polygon A shape or solid which has an indentation or "cave".
- 2. A perfect round ball.
- 3. A corner point of a geometric figure. For a polygon, vertices are where adjacent sides meet. For an angle, the vertex is where the two rays making up the angle meet.
- 4. The length of the boundary around a shape or a figure.
- 6. segment All points between two given points (including the given points themselves).
- 7. On the coordinate plane, the pair of numbers giving the location of a point (ordered pair).
- 9. A line segment, line, or plane that divides a geometric figure into two congruent halves.
- 10. A three dimensional figure with a single base tapering to an apex.
- 12. A three-dimensional geometric figure with parallel congruent bases.
- 13. A polyhedron whose one face is a polygon and the other faces are triangles with one common vertex.
- 16. polygon A geometric figure with no indentations.
- 17. A complete circular arc. Circumference also means the distance around the the outside of a circle.
- 18. A line segment where two faces of a polyhedron meet.
- 20. A solid bounded by at least four polygonal faces. The pairs of faces meet along their edges. Three or more edges meet in each vertex.
- 22. Also called non-coplanar lines. They are straight lines that are neither parallel, nor intersecting. They lie in different planes.
- 23. Lying on the same line.
- 24. angles The pair of angles opposite each other formed by two intersecting lines.
- 25. Also called half-line. It is a straight line that extends from a point.
- 30. A general conclusion proposed to be proved upon the basis of certain given hypotheses or assumptions; or, a general conclusion that has been proved.
- 32. term without fixed limits; indefinite in form, extent, or application
- 33. Logic. a proposition that requires no proof, being self-evident, or that is for a specific purpose assumed true, and that is used in the proof of other propositions
- 34. The point on a line segment that divides the given line segment into two congruent parts.
- 35. The size of a surface.
- 37. The distance from the center of a circle to any point on its circumference.
- 39. angles 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.
- 43. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.