the point of currrency

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Across
  1. 3. to go around or bypass
  2. 7. is one of the triangles point of concurrency formed by intersecting of the three triangles altitudes
  3. 10. a line segment that is both perpendicular to a side of a triangle and passes trough the midpoint
  4. 11. when they add up to 180 degrees
  5. 12. is a line that divides an angle into two congruent angles
  6. 13. is the line connecting the midpoints of the two sides of the triangle
  7. 16. a triangle with 3 acute angles less than 90 degrees
  8. 18. a line segment joining a vertex to the midpoint of the opposite side
  9. 19. is a line segment through a vertex and perpendicular
  10. 21. a pair of adjacent angles formed when tow lines intersect
Down
  1. 1. each of the pairs of opposite angles made by intersecting lines
  2. 2. is the middle point of a line segment
  3. 4. same/ a point is equidistant from others if it is the same distance to others
  4. 5. a triangle with 3 acute triangle angles more than 90 degrees
  5. 6. three or more lines in a plane in a higher dimensional space
  6. 8. a triangle having two sides of equal length
  7. 9. the center of a incircle of a triangle or other figures
  8. 14. a triangle having unequal sides
  9. 15. capability
  10. 17. the point at which the perpendicular bisectors of the sides of a triangle intersect and which is equidistant from the three vertices
  11. 20. the center of a triangle