Introduction to Geometry

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Across
  1. 4. Angle greater than 0 but less than 180 degrees.
  2. 6. Angle of 180 degrees
  3. 10. Angle of 360 degrees.
  4. 11. Lines that are at 90 degrees to each other.
  5. 12. Angle of 0 degrees
  6. 15. art of a straight line. It has two endpoints and can be measured using a ruler. We use two square brackets to denote that there are two endpoints.
  7. 17. If points lie on the same line they are said to be __________.
  8. 18. Angle greater than 180 degrees.
Down
  1. 1. A location or position on a plane. It has no dimensions. It is denoted by a capital letter and a dot.
  2. 2. A ray is part of a line that starts at a point and goes on forever in only one direction
  3. 3. Lines that never touch.
  4. 5. A flat, two-dimensional surface. ‘Two-dimensional’ means that it has length and width, but it has no thickness that stretches on to infinity (it goes on forever).
  5. 7. A statement without any proof.
  6. 8. Angles greater than 90 degrees but less than 180 degrees.
  7. 9. Angle of less than 90 degrees
  8. 13. A straight, infinitely thin one-dimensional figure that continues forever in both directions; it has no endpoints. A line can be named by any two points on the line or by a lowercase letter. It has an infinite number of points on it.
  9. 14. Angle of 90 degrees
  10. 16. Angles adding up to 180