Geometry crossword

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Across
  1. 3. Path with one endpoint extending infinitely.
  2. 5. Closed, flat shape with straight sides.
  3. 6. Having identical shape and size.
  4. 8. Corner where two line segments meet.
  5. 12. Lines meeting at right angles.
  6. 13. Figure formed by two radiating rays.
Down
  1. 1. Spot dividing a segment into halves.
  2. 2. Side-by-side lines that never intersect.
  3. 4. Segment Measurable path between two specific endpoints.
  4. 5. Total distance around a 2D shape.
  5. 7. Center-to-edge distance of a circle.
  6. 8. Capacity of a 3D space.
  7. 9. Infinite straight path going both ways.
  8. 10. a spot on the grid
  9. 11. Flat surface extending infinitely in 2D.