Geometry puzzle

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Across
  1. 2. A segment that joins the midpoints of two sides of a triangle
  2. 6. An angle with a degree measure of 90 degrees
  3. 7. A line segment or ray that divides an angle into two equal parts
  4. 10. An angle with a degree measure of 180 degrees
Down
  1. 1. The intersection of two rays at an endpoint
  2. 3. The point at which the three altitudes intersect in a triangle
  3. 4. The point at which the three perpendicular bisectors intersect in a triangle
  4. 5. The point at which the three angle bisectors intersect in a triangle
  5. 8. The point at which the three medians intersect in a triangle
  6. 9. A line that i=extends indefinitely in one direction