Geometry. Introduction

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Across
  1. 5. A part of a line that has one endpoint and extends infinitely in one direction.
  2. 6. A straight strip, typically marked at regular intervals and used to draw straight lines or measure distances.
  3. 7. Lines that form right angles.
  4. 10. Lines or planes that are always the same distance apart and never intersect.
Down
  1. 1. A triangle with one angle greater than 90 degrees.
  2. 2. An angle that measures exactly 90 degrees.
  3. 3. A polygon with three sides and three angles.
  4. 4. A tool used for measuring angles.
  5. 8. The point where two or more lines or geometric figures meet or cross.
  6. 9. An angle that measures less than 90 degrees.
  7. 11. A part of a line between two endpoints.