Geometry crossword puzzle

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Across
  1. 4. Two angles that share a common side and vertex ("next to each other")
  2. 6. the point at which three altitudes intersect
  3. 8. Adjacent angles that are supplementary combined. (they form a straight line)
  4. 12. two angles directly across from eachother on intersecting lines *always congruent*
  5. 13. the intersection of two rays at an endpoint
  6. 15. A circumcenter is a point which three _________ ________ intersect
  7. 17. A segment, line or plane that intersects a segment at its midpoint
  8. 18. The common endpoint of an angle {where the sides intersect}
  9. 20. The point at which the three medians intersect in a triangle
Down
  1. 1. a measurable part of a line consisting of two endpoints
  2. 2. A segment that connects a vertex of a triangle to the opposite side so that it is perpendicular to that side
  3. 3. Two lines that intersect at a 90° angle (right angle)
  4. 5. a point is a location with no size or shape
  5. 7. A segment that joins the two sides of a triangle
  6. 9. Two lines that NEVER intersect
  7. 10. A-line or ray that divides an angle into two equal parts
  8. 11. the Circumcenter is always equidistant from the _______
  9. 14. Flat surface made up of pants
  10. 16. An angle with a degree measure greater than 90°
  11. 19. A line that extends indefinitely in one direction