Geometry Crossword Puzzle

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Across
  1. 3. A line segment (or length) joining two points on a circles circumference and passes through the circle's center (twice the length of the radius)
  2. 8. Distance around a circle (the perimeter)
  3. 9. Part of a line between two points
  4. 10. A triangle with two equal length sides (and two equal internal angles)
  5. 13. Point at which two line segments intersect (forming an angle)
  6. 14. A polygon having six sides and six angles
  7. 15. A quadrilateral having both pairs of opposite sides parallel to each other.(Note: squares and rectangles are also quadrilaterals.)
  8. 18. Triangle A triangle with all three sides of equal length (each internal angles = 60°)
Down
  1. 1. Line segments that never intersect (they are always the same distance apart)
  2. 2. A polygon with four sides
  3. 4. Distance (line segment) from center of a circle to any point on that circle's circumference.
  4. 5. A triangle with all three sides with different lengths
  5. 6. Angle smaller than 90 degrees
  6. 7. A location in space - a dot on a piece of paper
  7. 11. Angle larger than 90 degrees
  8. 12. The part of a straight line considered as originating at a point on the line and as extending in one direction from that point.
  9. 15. A polygon with 5 sides and 5 angles
  10. 16. Angle An angle that measures 90 degrees
  11. 17. A polygon having eight angles and eight sides
  12. 19. Connects two points via the shortest path and continues indefinitely (forever) in both directions