Class 7 Maths Chapter 5 Lines And Angles Exercise 5.1 pdf notes:-

**Exercise 5.1** Class 7 maths Chapter 5 Pdf Notes:-

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## Ncert Solution for Class 7 Maths Chapter 5 Lines And Angles Exercise 5.1 Tips:

**INTRODUCTION**

A line segment has two end points.

points. If we extend the two end points in either

direction endlessly, we get a line. Thus, we can say that a line has no end points. On the other

hand, recall that a ray has one end point

Again recall that an angle is formed when lines or line segments meet.When the sum of the measures of two angles is 90Ā°, the angles are called complementary

angles.

pairs of angles are called supplementary angles.

When two angles are supplementary, each angle is said to be the supplement of the other.

The angles in a linear pair are supplementary.

Have you noticed models of a linear pair in your environment?

Note carefully that a pair of supplementary angles form a linear pair when

placed adjacent to each other. Do you find examples of linear pair in your daily life?Observe a vegetable chopping board

We conclude that when two lines intersect, the vertically opposite angles so

formed are equal.

WHAT HAVE WE DISCUSSED?

1.We recall that (i) A line-segment has two end points.

(ii) A ray has only one end point (its initial point); and

(iii) A line has no end points on either side.

2.When two lines l and m meet, we say they intersect; the meeting point is called the

point of intersection.

When lines drawn on a sheet of paper do not meet, however far produced, we call

them to be parallel lines.

4.(i) When two lines intersect (looking like the letter X) we have two pairs of opposite

angles. They are called vertically opposite angles. They are equal in measure.

(ii) A transversal is a line that intersects two or more lines at distinct points.

(iii) A transversal gives rise to several types of angles.