Geometry Vocabulary

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Across
  1. 1. A point on a line segment that divides the segment into two congruent segments.
  2. 4. When two circles have the same radius.
  3. 7. Two lines are parallel if they are in the same plane and never intersect.
  4. 9. A polygon that has all interior angles less than 180°.
  5. 12. Writing reasoned, logical explanations that use definitions, axioms, postulates, and previously proved theorems to arrive at a conclusion about a geometric statement
  6. 14. Two lines the lie in the same plane.
  7. 15. Term that is described but is not precisely defined, because it is impossible.
  8. 17. A straight set of points that extends into infinity in both directions.
  9. 18. Accept fact but is not proven because it is possible.
  10. 19. Proven fact through logic and use of definitions.
  11. 22. Pair of adjacent angles formed when two lines intersect.
  12. 24. Two angles that share the same vertex and have one side in common between them.
  13. 26. Special kind of drawing for which we use only a compass and a straightedge.
  14. 27. A three-dimensional figure with all points in space a fixed distance from a given point, called the center.
  15. 30. A pair of angles that add up to 90°.
  16. 33. Part of a line, with one endpoint, and extending to infinity in one direction.
  17. 34. The point on an angle where the two sides intersect.
  18. 38. Lying on the same straight line.
  19. 40. A set of angels directly opposite of each other, formed by the intersection of straight lines.
  20. 41. Solid formed by rotating a right triangle around one of its legs.
  21. 42. The side of a polygon or line segment where two faces of a solid figure meet.
  22. 45. The side opposite the right angle in a right triangle.
  23. 46. An angle whose measure is 90 degrees.
  24. 47. The sum of the lengths of the sides of a polygon.
  25. 48. The surface included within a closed figure, measured by the number of square units needed to cover the surface.
  26. 49. A flat surface of a three-dimensional figure.
Down
  1. 2. The line segment joining two points on a circle and passing through the center of the circle.
  2. 3. Three-dimensional geometric shape.
  3. 4. A set of numbers or letters. ex. (2,5)
  4. 5. Two points on a line, and all the points between those two points.
  5. 6. The complete distance around a circle or a closed curve.
  6. 8. polygon Polygon that has one or more interior angles greater than 180°.
  7. 10. A location in a plane or in space, having no dimensions.
  8. 11. Two rays that both start from a common point and go off in exactly opposite directions.
  9. 13. A three-dimensional figure that has a polygon for its base and whose faces are triangles having a common vertex.
  10. 16. Lines that are not in the same plane and that do not intersect.
  11. 20. A flat surface that stretches into infinity
  12. 21. A pair of opposite angles that is formed by intersecting lines.
  13. 23. A three-dimensional solid that is bounded by plane polygons.
  14. 25. A closed plane figure made up of several line segments that are joined together.
  15. 28. A three-dimensional shape with identical parallel bases, all other faces are rectangular.
  16. 29. An angle whose measure is greater than 90 degrees.
  17. 31. Two lines are perpendicular if the angle between them is 90 degrees.
  18. 32. An angle with a measure between 0° and 90°.
  19. 35. Two angles are supplementary if their sum is 180 degrees.
  20. 36. A straight line or a plane that divides a line, a plane, an angle, or a shape into two equal parts.
  21. 37. At some point along a scale from one amount, distance, weight etc to another
  22. 39. The distance from the center to a point on a circle; the line segment from the center to a point on a circle.
  23. 43. Figure formed by two rays sharing a common endpoint.
  24. 44. A unit of measure of an angle.