Geometry

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Across
  1. 2. Double the radius
  2. 4. A part of a curve
  3. 7. A shape that has three vertices
  4. 9. Half of 2 across
  5. 10. two lines that run the same direction
  6. 11. The space between two intersecting lines or surfaces at or close to the point where they meet
Down
  1. 1. A quadrilateral figure that has two parallel and two nonparallel sides
  2. 3. Any of a set of straight lines passing through one point
  3. 5. The line segment between two point on a given curve
  4. 6. The intersection point of two sides of a plain figure
  5. 8. A shape with nine sides
  6. 10. A position in space