Per 5 Yu

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Across
  1. 2. A flat surface that can extend forever in length and width but has no thickness. The
  2. 8. A point at which the two rays of an angle meet or the intersection point of two sides of a plane figure.
  3. 9. The side opposite the right angle in a right triangle.
  4. 12. Part of a line between two points called endpoints.
  5. 18. A statement accepted as true without proof. A postulate should be so simple and direct that is seems to be unquestionably true.
  6. 19. The pair of angles opposite each other formed by two intersecting lines.
  7. 21. A unit of measure used to measure the magnitude of an angle, equal in magnitude to 1/360 of a complete revolution.
  8. 23. The figure formed by two rays from the same initial point.
  9. 25. A general conclusion proposed to be proved upon the basis of certain given hypotheses or assumptions; or, a general conclusion that has been proved, e.g., Pythagorean Theorem, Binomial Theorem, Fundamental Theorem of Algebra, etc.
  10. 26. A straight line or a plane that divides a line, a plane, an angle, or a shape into two equal parts.
  11. 29. Often referred to as the right cone. A cone is a solid formed by rotating a right triangle around one of its legs.
  12. 30. Two angles that share the same vertex and have one side in common between
  13. 31. line.
  14. 33. A geometric object that has no dimension and is used to indicate a location.
  15. 34. The boundary line of a circle or the length of such a boundary line.
  16. 37. The path of a point moving in opposite directions infinitely.
  17. 38. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.
  18. 41. Angle opposite side is greater than 60°.
  19. 43. Lines that are neither parallel nor intersecting
  20. 44. A perfect round ball. A sphere is a closed solid bounded by a surface on which all points are equidistant from a central point called the center.
  21. 45. A line segment where two faces of a polyhedron meet.
  22. 46. A polyhedron whose one fac is a polygon and the other faces are triangles with one common vertex.
  23. 47. The distance from the center of a circle to any point on its circumference.
  24. 48. The surface included within a closed figure, measured by the number of square units needed to cover the surface.
  25. 49. of a calm sea and a flat valley are all physical models of a plane.
Down
  1. 1. An angle that is between 90° and 180°.
  2. 2. A closed plane figure bounded by at least three line segments.
  3. 3. 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.
  4. 4. Lying on the same straight line.
  5. 5. The set of all the elements within a particular universal set that are not elements of the given set.
  6. 6. An angle that measures 90°.
  7. 7. Two rays with common endpoint that point in opposite directions and form a
  8. 10. The length of the boundary around a shape or a figure.
  9. 11. Two angles that add up to 180°
  10. 13. Intuitively speaking, curved away from the eye. A concave figure is a set of points some of whose chords include points that are in the set.
  11. 14. The point on a line segment that divides the given line segment into two congruent parts.
  12. 15. At a 90° angle Note: Perpendicular lines have slopes that are negative reciprocals
  13. 16. Can be combined to define other terms. Noncollinear points , for example, are points that do not lie on the same line.
  14. 17. Also called half-line. It is a straight line that extends from a point.
  15. 20. Points or lines that all lie in the same plane.
  16. 22. To draw a figure, usually under certain specific restrictions such as using only a straightedge and compasses.
  17. 24. Intuitively speaking, curved outward or toward the eye. A convex curve is a set of points any of whose chords do not include any point that is not in the set.
  18. 27. An angle with a measure between 0° and 90°.
  19. 28. Two lines that never intersect… This means that the two lines are always the same distance apart
  20. 29. A pair of numbers that describe the position of a point on a coordinate plane by using the horizontal and vertical distances from the two reference axes.
  21. 32. Having one thing on either side of it. 2 is between 1 and 3.
  22. 35. Planar figures or solid shapes that have the same shape and size.
  23. 36. A can-shaped solid figure.
  24. 39. A solid bounded by at least four polygonal faces.
  25. 40. A space figure with two parallel polygonal bases that are the same shape and the same size.
  26. 42. A pair of adjacent angles formed by intersecting lines.
  27. 50. A planar surface of a solid figure.