Geometry

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Across
  1. 5. an angle less than 90 degrees but greater than 0 degrees
  2. 9. the intersection point of two sides of a plane figure
  3. 10. a triangle with all sides equal and all angles equal
  4. 11. line segments that cross each other
  5. 13. two line segments which cross to form 90 degree angles
Down
  1. 1. a 90 degree angle
  2. 2. line segments that do not intersect
  3. 3. an angle greater than 90 degrees but less than 180 degrees
  4. 4. a triangle with one internal angle equal to 90 degrees
  5. 6. a position in space
  6. 7. a straight line extending from the center of a circle or sphere to the circumference or surface
  7. 8. a straight line passing through the center of a circle or sphere and meeting the circumference or surface at each end
  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