Geometry - basic terms

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Across
  1. 3. A rectangle with all sides equal in length.
  2. 4. A quadrilateral with four right angles.
  3. 6. A straight path that extends infinitely in both directions.
  4. 7. A part of a line with two endpoints.
  5. 9. A closed plane figure made of straight line segments.
Down
  1. 1. The property of figures having the same shape and size.
  2. 2. The common endpoint of two sides of an angle or polygon.
  3. 3. A straight edge of a polygon.
  4. 4. A part of a line that starts at one point and extends infinitely in one direction.
  5. 5. A polygon with three sides and three angles.
  6. 8. The figure formed by two rays with a common endpoint.
  7. 9. A location in space with no size or shape.