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Intersecting Lines
Two lines l and m are said to be intersecting, if they pass through a common point P.
m
P l
Examples of intersecting line segments:
1. Adjacent edges of a wall 2. Addition symbol 3. Diagonals of a square
Parallel Lines Do you know?
Two lines l and m are parallel, if they have no common Lines in space that are
point, i.e., these lines do not intersect or meet each other. neither parallel not
l intersecting are called
skew lines.
m
Examples of parallel lines:
1. Opposite sides of a 2. Opposite edges of a 3. Opposite edges of a
parallelogram rectangular table notebook
Collinear Points
Three or more points are said to be collinear, if they lie on a line.
Q
A B C P R
Collinear points Non-collinear points
Concurrent Lines
Three or more lines are said to be concurrent if they pass through the same point.
Concurrent lines Non-concurrent lines
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