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2-9straight line6
2-9.1
straight line
the straight line is parallel to the straight line
2-9.2
perpendicular to the straight line
the straight line is perpendicular to the straight line
2-9.3
angle at triangle vertex
angle at vertex in the triangle
2-9.4
line segment
line segment from to
2-9.5
vector from point A to B
vector from to
2-9.6
distance between points A and B
distance between points and
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