Geometry

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Across
  1. 3. a measurable part of a line that consists of two points, called endpoints and all of the points between them
  2. 4. the point halfway between the endpoints of a segment
  3. 5. an angle formed by one side of a triangle and the extension of another side
  4. 6. co-planar lines that do not intersect
Down
  1. 1. two angles with measures that have a sum of 180
  2. 2. the intersection of two non-co-linear rays at a common end point