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This video explains the basic terms and concepts related to lines and angles.
Class 9
Chapter 6
lines and angles
Basic concepts and terms
NCERT
Point
line
ray
line segment
collinear points
non collinear points
intersecting lines
parallel lines
vertex
arm
angles
adjacent angles
types of angles
acute
obtuse
right
straight
reflex
complete
vertically opposite angles
alternate angles
linear pair
complementary angles
supplementary angles
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