Geometry Crossword

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Across
  1. 2. the middle point of a line segment
  2. 3. two rays with a common end point
  3. 4. the sum of two angles is 90 degrees
  4. 6. four parts of a coordinate plane
  5. 8. a line with a single endpoint that extends indefinitely in one direction
  6. 9. a part of a line bounded by two points
Down
  1. 1. the sum of two angles is 180 degrees
  2. 3. an angle that measures less than 90 degrees
  3. 5. an angle that measures more than 90 degrees but less than 180
  4. 7. geometric elements of equal measure