GC3rd Biggs

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Across
  1. 1. flat or level surface
  2. 3. Two or more straight coplanar lines that do not intersect.
  3. 6. these three terms are point, line, and plane
  4. 7. in the space separating (two points, objects, etc.
  5. 8. one of two opposite and equal angles formed by the intersection of two lines.
  6. 10. the outer boundary, especially of a circular area; perimeter
  7. 11. coinciding at all points when superimposed
  8. 13. two rays with a common end point that point in opposite directions
  9. 16. A pair of adjacent angles formed by intersecting lines
  10. 17. angle greater than 90 degrees but less than 180 degrees
  11. 20. a polygon such that there is a straight line that cuts it in four or more points
  12. 21. A general conclusion proposed to be proved upon the basis of certain given hypotheses or assumptions
  13. 22. a solid whose surface is generated by a line passing through a fixed point and a fixed plane curve not containing the point, consisting of two equal sections joined at a vertex.
  14. 23. A set of logical arguments used to deduce or prove a mathematical theorem from a set of axioms.
  15. 25. a polygon such that no side extended cuts any other side or vertex; it can be cut by a straight line in at most two points
  16. 26. an angle of 90 degrees
  17. 27. lying in the same straight line.
  18. 28. the point on a line segment or an arc that is equidistant
  19. 29. A line segment that passes through the center of a circle and has its two endpoints on the circle.
  20. 30. meeting line or surface
  21. 32. border or outer boundary
  22. 34. A polyhedron whose one face is a polygon and the other faces are triangles with one common vertex
  23. 38. when two lines intersect and four angles form
  24. 42. any particular extent of space or surface
  25. 43. closed solid bounded by a surface on which all points are equidistant from a central point called the center.
  26. 45. An angle whose measure is between 0° and 90°. Compare obtuse angle.
Down
  1. 1. A statement accepted as true without proof
  2. 2. the space within two lines or three or more planes diverging from a common point, or within two planes diverging from a common line.
  3. 4. An additional geometric figure that is constructed to assist in solving a problem or producing a proof.
  4. 5. two angles having the same vertex and having a common side between them.
  5. 9. Two angles that add up to 180°.
  6. 10. being in the same plane
  7. 12. sharp end
  8. 14. They are straight lines that are neither parallel, nor intersecting. They lie in different planes.
  9. 15. It is a straight line that extends from a point.
  10. 18. the side of a right triangle
  11. 19. The path of a point moving in opposite directions infinitely
  12. 20. A pair of angles that add up to 90°.
  13. 22. A can-shaped solid figure.
  14. 24. A point at which the two rays of an angle meet or the intersection point of two sides of a plane figure.
  15. 31. Part of a line between two points called endpoints.
  16. 32. closed plane figure
  17. 33. straight line extending from the center of a circle
  18. 35. scale of amount
  19. 36. same order or degree
  20. 37. a line or plane that bisects an angle or line segment.
  21. 39. solid with many faces
  22. 40. border at which a surface terminates
  23. 41. A space figure with two parallel polygonal bases that are the same shape and the same size.
  24. 44. A planar surface of a solid figure.