Page 202 - New Medley 4 Semester 1
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Line Segment: It has two end points and thus its length
can be measured. In the adjoining figure, P and Q are
P PQ Q
the two end points of line segment PQ. Symbolically, it
is written as PQ.
Line: When a line segment is extended endlessly in both
P Q
the directions, we get a line. Here, we see a line PQ. PQ
Symbolically, it is written as PQ.
Ray: When a line segment is extended endlessly in one
P PQ Q direction, we get a ray. Here, we see ray PQ and ray QP.
P QP Q Symbolically, they are written as PQ and PQ (or QP )
respectively.
Types of Line: Commonly, lines are of following types:
Horizontal Lines Vertical Lines Slant Lines
Curved Lines: The lines which are not straight are called curved lines.
Simple Closed Curve: The curve which has the same initial and final point
crossing over at any point is called a simple closed curve.
Open Curve: The curve which has different initial and end points is called
an open curve.
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