geometry

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Across
  1. 2. of concurrency- a point where three or more lines intersect.
  2. 3. proof- a style of proof that uses boxes and arrows to show the structure of the proof.
  3. 5. of a triangle- a segment whose endpoints are a vertex of the triangle and the midpoint of the opposite side.
  4. 7. of a circle- a line that intersects a circle at two points.
  5. 8. of a triangle- the point of concurrency of the three altitudes of a triangle.
  6. 10. of a triangle- the point of concurrency of the three angle bisectors of a triangle.
  7. 12. proof- a style of proof in which the statements and reasons are presented in paragraph form.
  8. 14. of a triangle- The perpendicular segment from a vertex to the line containing the opposite side.
  9. 15. of a triangle- the point of concurrency of the three medians of a triangle. Also known as the center of gravity.
Down
  1. 1. of a triangle- the point of concurrency of the three perpendicular bisectors of a triangle.
  2. 4. lines- Three or more lines that intersect at one point.
  3. 6. reciprocal- the opposite of the reciprocal of a number.
  4. 9. circle- a circle that contains all vertices of a polygon.
  5. 11. line- the line connecting the circumcenter, centroid, and orthocenter of a triangle.
  6. 13. length- the distance along an arc measured in linear units.