Quick Revision: Lines and Angles Video Lecture | Mathematics (Maths) Class 7 (Old NCERT)

0:0:0: hello children today we are going to
0:0:2: learn the concept of lines and
0:0:4: angles so let's start with some basic
0:0:8: understanding of Lines line is a
0:0:10: straight path extending in both
0:0:13: directions line segment is a part of
0:0:16: line included between two end points Ray
0:0:19: is a part of line with one end point now
0:0:23: that we've explored the basics of Lines
0:0:26: line segments and Rays let's dive deeper
0:0:29: into how these Concepts help us
0:0:31: understand something called angles ready
0:0:34: to find out what angles are let's go
0:0:38: angle is the space between two
0:0:40: intersecting straight lines at the point
0:0:42: in which they meet the point where they
0:0:44: meet is called the
0:0:46: vertex angles are measured in degrees
0:0:50: with our new found knowledge of what
0:0:52: angles are and how we identify them it's
0:0:55: time to classify these angles into
0:0:57: different types each type has its own
0:1:0: unique properties and names let's see
0:1:3: what these
0:1:4: are types of angles are linear pair of
0:1:8: angles corresponding angles alternate
0:1:11: angles co- interior angles and
0:1:13: vertically opposite
0:1:16: angles what makes corresponding angles
0:1:19: special let's find out the highlighted
0:1:23: angles are one of the pairs of
0:1:24: corresponding angles and are
0:1:27: equal next let's shift our Focus to
0:1:30: another fascinating angle relationship
0:1:32: called alternate
0:1:34: angles how do these angles interact with
0:1:37: each other when lines are
0:1:39: parallel all the same color angles are
0:1:42: pairs of alternate angles and are always
0:1:44: equal if the lines are
0:1:47: parallel lastly not all angle
0:1:49: relationships are about equality some
0:1:52: involve
0:1:53: addition this brings us to non-
0:1:55: alternate angles also known as Co
0:1:58: interior angles let's explore how these
0:2:1: angles work together to maintain balance
0:2:5: the sum of these angles is
0:2:8: 180° or we can say that Co interior
0:2:12: angles are
0:2:14: supplementary after learning about the
0:2:17: different types of angles let's explore
0:2:19: an interesting scenario when two lines
0:2:21: never meet no matter how long they
0:2:24: extend this happens when lines are
0:2:27: parallel but how can we be sure Lin are
0:2:30: truly
0:2:31: parallel there are certain conditions
0:2:33: that help us determine this lines l and
0:2:37: m are parallel if any of the following
0:2:39: is true pairs of alternate angles are
0:2:43: equal that is angle D is equal to angle
0:2:47: F angle B is equal to angle H pairs of
0:2:51: corresponding angles are
0:2:53: equal that is angle a is equal to angle
0:2:56: e angle G is equal to angle C the sum of
0:3:0: the Interior or exterior angles on the
0:3:3: same side of the transversal is
0:3:7: 180° that is angle D + angle e is equal
0:3:11: to
0:3:13: 180° we hope that you have understood
0:3:15: the topic you can now study chapter
0:3:18: notes watch video lectures and solve McQ
0:3:22: tests of this chapter on ADF to ensure
0:3:24: you score well in your school
0:3:26: exams and that's not all you also get
0:3:29: amazing courses for maths science
0:3:32: English Hindi and much more for Class 7
0:3:36: thank you