Question

Concepts of Ch Lines And Angles For class 9th
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Answer 1

Answer:

1.  Two angles are called adjacent angles if

      (a)   they have the same vertex.

      (b)   they have a common arm and

      (c)   uncommon arms are on either side of the common arm.

2.  Two adjacent angles are said to form a linear pair of angles, if their non-common arms are two opposite rays.

3.  The sum of all the angles round a point is equal to 360°.

4.  If two lines intersect, then the vertically opposite angles are equal.

5.  A line which intersects two or more given lines at distinct points, is called a transversal of the lines.

6.  Two angles on the same side of a transversal are known as corresponding angles if both lie either above the two lines or below the two lines.

Answer 2

Hello!

✍️The pairs of lines are nothing but the two lines, which may be intersects or parallel or perpendicular as shown below:

✍️Angles: The region between two infinitely long lines pointing a certain direction (ray) from a common point (or vertex) is termed as an angle

Thank you!