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SAI INTERNATIONAL SCHOOL
CLASS -7
Chapter-5: LINES AND ANGLES
Mathematics
Lesson Note-1
TOPIC: Introduction to lines and angles
SUBTOPIC: Points, line segment, line, ray, parallel lines, intersecting lines,
angles, complementary angles, supplementary angles, adjacent angles, linear
pair, vertically opposite angles.
Definition Example
Points A point is an exact To locate the house of five friends on a
position or location on a map, we can name them as point A, B, C,
plane surface. D, E.
A point is shown by a
dot. It has no
dimensions i.e. no
length, breadth or width.
It is usually denoted by a
capital letter.
Collinear points Three or more points
that lie on the same line
are collinear points.
Line segment A line segment
corresponds to the
shortest distance
between two points.
It has two end points.
It has a fixed/definite
length.
The line segment joining
points A and B is
denoted by .
