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Chapter 5: Measures of Lines and Angles

    Introduction

    Measuring Line Segments

    Measuring of an Angles

    Intersecting Lines

    Exercise 5.1

    Exercise 5.2

    Exercise 5.3

    What Have We Discussed

    Enhanced Curriculum Support

    Easy Level Worksheet

    Moderate Level Worksheet

    Hard Level Worksheet

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Chapter 5: Measures of Lines and Angles > Exercise 5.1

Exercise 5.1

(1) Give any five examples of line segments observed in your classroom.

Edge of the blackboard
Rim of the wall clock
Circular top of a bottle cap
Top side of a classroom door
Edge of a window pane
Curved edge of a fan blade
The curve of a smiley drawn on the board
Circular edge of a plate in the classroom
Side of a teacher’s table
Edge of a chalk piece
Line Segments
Not Line Segments

(2) Why is it better to use a divider than a ruler while comparing two line segments?

Answer:

While finding the length of any object, the eye should be correctly positioned (i.e.) just the marks concerned. Otherwise, there may be an error due to angular viewing.

To avoid this problem, a better way is to use a divider.

(3) Measure all the line segments in the figure given below and arrange them in ascending order of their lengths.

Answer :

Line SegmentLength
\overline{AB} cm
\overline{AC} cm
\overline{AD} cm
\overline{AE} cm
\overline{BC} cm
\overline{BD} cm
\overline{BE} cm
\overline{CD} cm
\overline{CE} cm
\overline{DE} cm

Ascending Order

AB
AC
AD
AE
BC
BD
BE
CD
CE
DE

(4)The midpoint of \overline{AB} is located by Swetha and Reshma like this. Which one do you feel is correct? Measure the lengths of \overline{AC}, \overline{CB} and verify.

Answer :

By observation, we can say that the midpoint of \overline{AB} located by is correct. (Since \overline{AC} = \overline{CB})

(5) Each of these figures given along side has many line segments. For the almirah we have shown one line segment along the longer edge. Identify and mark all such line segments in these figures.

Answer:

(i) Triangular Prism: , , , , , , , , .

(ii) Suitcase: , , , , , , , , , , ,

(iii) Almirah: , , , , , , , , , , ,