Measuring the Line Section | Evaluating Line Segments

We’ll talk about right here about measuring the road phase i.e. how
to attract and measure a line phase utilizing scale or ruler.

We will measure a line phase by two methods.

(i) With the assistance of scale or ruler solely.

(ii) With the assistance of a pair of dividers and a scale or
ruler.

Measuring a line phase with the assistance of a scale:

Typically, we measure a line phase with the assistance of a scale which has marking in centimetres (cm) and inches (in). Largely we measure the road segments in centimetres. Every centimetre is split into 10 small equal elements, known as millimetres (mm).

1 cm. = 10 mm. and 1 mm. = (frac{1}{10}) cm.

A line phase has a starting and an finish. The road phase is part of a line. It has two finish factors denoted by A and B.

Allow us to discover ways to measure a line phase. We use a scale to measure the road segments. Centimeters and inches are marked alongside the 2 edges of the size.

Allow us to be taught to measure the size of a line phase AB in centimeters.

For measuring the size of a line phase AB, we place in
such a approach that the top level A of the road phase coincides with 0 mark of
the size.

We maintain the size correctly alongside the road phase. We learn the mark
on the size that coincides with the top level B. Right here, we see that the seventh
centimetre mark on the size that coincides with the top level B. Right here, we see
that the seventh centimetre mark coincides with the top level B. Thus,
the size of the road phase AB is 7 cm.

We must always take some precautions whereas measuring a line
phase. Typically, due to damaged nook 0 mark of the size doesn’t
seem. If it’s so, we will place every other level centimetre mark of the size
on the top level A and measure the road phase AB by counting from that
centimetre mark.

Step I: Place the sting of scale on the road AB such that its ‘0’ mark is at level ‘A’.

Step II: Learn the size on the level ‘B’. Right here the mark on the size is at 8 cm.

AB is a line phase. So, the size of line phase AB is 7 cm.

Measuring a line
phase with the assistance of a divider and a scale:

We will use a divider together with a scale to measure a line phase.

We open the pair of divider rigorously and place the pointed ends of the pair of
divider on the each ends of the road phase as proven right here. We raise divider
very rigorously with out disturbing its arms.

Now we place its one finish on the
zero mark of the size and let its different finish relaxation at a sure mark of the
scale as proven right here.

Lastly, then we learn the size.

A divider has two arms with sharp pointed ends. The gap
between the top factors may be elevated or decreased.

Place the divider on the road phase RS such that one among
its sharp finish is on ‘R’ and the opposite sharp finish is on ‘S’.

Take away the divider and place it on the size and measure the
distance.

Evaluating Line Segments

Line segments may be in contrast utilizing a ruler in addition to a
divider.

(i) Utilizing a Ruler:

Measure the road segments and discover which is longer or
shorter.

(ii) Utilizing a Divider:

Examine the road segments AB and PQ.

Place the top factors of the divider on the top factors A and
B of AB as proven in fig. (a)

Elevate the divider with out disturbing its arms. Place the top
level of 1 arm at P and see the place the top level of the opposite arm falls. (as proven in fig (b)

Let it fall at R.

If ‘Q’ is forward of R                           (overline{AB}) is shorter than PQ

If ‘R’ is forward of Q                           (overline{AB}) is longer than PQ

If ‘Q’ and R coincide                        (overline{AB}) and PQ are of identical size.

Questions and Solutions on Measuring the Line Section:

1. Measure the next line segments.

(i)		= _____ cm
(ii)		= _____ cm
(iii)		= _____ cm
(iv)		= _____ cm

2. Measure all line segments within the following figures.

(i)

PQ = _____ cm QR = _____ cm RS = _____ cm SP = _____ cm PR = _____ cm QS = _____ cm

(ii)

PQ = _____ cm QR = _____ cm RS = _____ cm SP = _____ cm PR = _____ cm QS = _____ cm

4th Grade Math Actions

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