Geometry

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Across
  1. 4. the perpendicular line segment from a vertex to the straight line of the opposite side
  2. 6. the vector the absolute value of which is 0
  3. 8. the common point of the altitudes
  4. 9. a geometric transformation given by a vector
  5. 10. a directed line segment
Down
  1. 1. the line segment connecting the midpoints of two sides of a triangle
  2. 2. the line segment in a triangle which connects a vertex with the midpoint of the opposite side
  3. 3. the midline of a triangle is ... with the third side of the triangle
  4. 5. the intersection point of the medians in a triangle
  5. 7. another word for an altitude