5th Dukes

12345678910111213141516171819202122232425262728293031323334353637383940414243444546
Across
  1. 1. A planar surface of a solid figure.
  2. 4. A closed plane figure bounded by at least three line segments.
  3. 7. Also called non-coplanar lines. They are straight lines that are neither parallel, nor intersecting. They lie in different planes.
  4. 8. The two supplementary adjacent angles formed by two intersecting lines
  5. 11. The point on a line segment that divides the given line segment into two congruent parts.
  6. 13. The boundary line of a circle or the length of such a boundary line.
  7. 15. 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. A diagonal of a polyhedron is a line segment joining two vertices that are not in the same face.
  8. 17. The pair of angles opposite each other formed by two intersecting lines.
  9. 24. In geometry, a pair of angles is said to be vertical (also opposite and vertically opposite, which is abbreviated as vert. opp. ∠s) if the angles are formed from two intersecting lines and the angles are not adjacent.
  10. 26. A pair of angles that add up to 90°.
  11. 30. polygon 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.
  12. 32. rays two rays with a common endpoint that form a line
  13. 34. Two angles that add up to 180°.
  14. 36. 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.
  15. 37. outside of a circle or an ellipse is the convex side; so is the outer surface of a sphere.
  16. 38. 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.
  17. 40. An angle that is between 90° and 180°.
  18. 42. The figure formed by two rays from the same initial point.
  19. 43. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.
  20. 44. side by side and having the same distance continuously between them.
  21. 45. The distance from the center of a circle to any point on its circumference.
  22. 46. A line segment where two faces of a polyhedron meet.
Down
  1. 2. Often referred to as the right cone.
  2. 3. A polyhedron whose one face is a polygon and the other faces are triangles with one common vertex.
  3. 4. The length of the boundary around a shape or a figure.
  4. 5. Points or lines that all lie in the same plane.
  5. 6. Lying on the same straight line.
  6. 8. Part of a line between two points called endpoints.
  7. 9. suggest or assume the existence, fact, or truth of (something) as a basis for reasoning, discussion, or belief.
  8. 10. In mathematics, logic, and formal systems, a primitive notion is an undefined concept. In particular, a primitive notion is not defined in terms of previously defined concepts, but is only motivated informally, usually by an appeal to intuition and everyday experience.
  9. 12. The path of a point moving in opposite directions infinitely.
  10. 14. Planar figures or solid shapes that have the same shape and size.
  11. 15. In geometry, two lines or planes (or a line and a plane), are considered perpendicular (or orthogonal) to each other if they form congruent adjacent angles (a T-shape).
  12. 16. A can-shaped solid figure.
  13. 18. Two angles that share the same vertex and have one side in common between them.
  14. 19. A geometric object that has no dimension and is used to indicate a location.
  15. 20. 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.
  16. 21. An additional geometric figure that is constructed to assist in solving a problem or producing a proof.
  17. 22. A straight line or a plane that divides a line, a plane, an angle, or a shape into two equal parts.
  18. 23. A flat surface that can extend forever in length and width but has no thickness. The surface of a calm sea and a flat valley are all physical models of a plane.
  19. 25. The side opposite the right angle in a right triangle.
  20. 27. An angle with a measure between 0° and 90°.
  21. 28. Having one thing on either side of it.
  22. 29. Also called half-line. It is a straight line that extends from a point.
  23. 31. A point at which the two rays of an angle meet or the intersection point of two sides of a plane figure.
  24. 33. A perfect round ball.
  25. 35. 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. 36. A unit of measure used to measure the magnitude of an angle, equal in magnitude to 1/360 of a complete revolution.
  27. 39. The surface included within a closed figure, measured by the number of square units needed to cover the surface.
  28. 41. 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.
  29. 44. a solid geometric figure whose two end faces are similar, equal, and parallel rectilinear figures, and whose sides are parallelograms.