Understanding Elementary Shapes Class6

UNDERSTANDING
ELEMENTARY SHAPES
GRADE 6; CHAPTER 5
MEASURING LINE SEGMENTS
Let’s get used to some geometry tools:

https://
www.chalopadho.com/t/classroom/1127/chapter/101?topic=25742&sh
ow_which=none
https://www.youtube.com/watch?v=yTFfWMCZYK4
A line segment is a fixed part of the line, so it must have some length.
We can compare any line segment on the basis of their length.
Ways to measure Line segments:
1. Comparison by Observation
We can tell which line segment is greater than other just by observing the
two line segments but it is not sure.
Here we can clearly say that AB > CD but sometimes it is difficult to tell
which one is greater.
2. Comparison by Tracing
In this method we have to trace one line on paper then put the
traced line segment on the other line to check which one is greater.
But this is a difficult method because every time to measure the
different size of line segments we have to make a separate line
segment.
3. Comparison using Ruler and a Divider
We can use a ruler to measure the length of a line segment.
Put the zero mark at point A and then move toward l to measure the length of the line segment, but
it may have some errors on the basis of the thickness of the ruler.
This could be made accurate by using a Divider.
Put the one end of the divider on point A and open it to put another
end on point B.
Now pick up the divider without disturbing the opening and place it
on the ruler so that one end lies on “0”.
Read the marking on the other end and we can compare the two
line.
Let’s practice some questions:
NCERT EXERCISE: 5.1

Can you answer the following questions?
TIME FOR ACTIVITY:
https://
study.com/academy/practice/drawing-measuring-line-segments-qui
z-worksheet-for-kids.html
Click on the link above to play a quiz!!

ANGLES
HW:
Exercise 5.3
ANGLES IN REAL LIFE
Angles In a Clock:
https://www.youtube.com/watch?v=0EUgp49AAPY&t=67s
HOUR MINUTE
HAND HAND
TIME ANGLE / REVOLUTION TIME ANGLE / REVOLUTION
3 Hrs 90 / (1/4) 15 Mins 90 / (1/4)
6 Hrs 180 / (2/4) 30 Mins 180 / (2/4)
9 Hrs 270 / (3/4) 45 Mins 270 / (3/4)
12 Hrs 360 / (4/4) 60 Mins- 1 360 / (4/4)

Hr
NCERT EXERCISE: 5.2

Angles In Directions:
https://www.youtube.com/watch?v=NSsZ4CdzYfY
NCERT EXERCISE: 5.2

MEASURING ANGLES
Let’s explore:
https://www.geogebra.org/search/MEASURING%20ANGLES
MEASURING ANGLES
An angle is measured in the “degree”. One complete revolution is divided into

360 equal parts so each part is one degree. We write it as 360° and read as
“three hundred sixty degrees".
We can measure the angle using a ready to use device called Protractor.
It has a curved edge which is divided into 180 equal parts. It starts from 0° to
180° from right to left and vice versa.
To measure an angle using protractor-
Place the protractor on the angle in such a way that the midpoint of protractor
comes on the vertex B of the angle.
Adjust it so that line BC comes on the straight line of the protractor.
Read the scale which starts from 0° coinciding with the line BC.
The point where the line AB comes on the protractor is the degree measure of
the angle.
NCERT EXERCISE: 5.4

HANDOUT UPLOADED ON DRIVE!!
HW:
Exercise 5.4: Q11

PERPENDICULAR LINES
If two lines intersect with each other and form an angle of 90° then they must be
perpendicular to each other.
Here AB and MN are intersecting at point N and form a

right angle. We will write it as AB ⊥ MN or MN ⊥ AB
Read as AB is perpendicular to MN or MN is perpendicular to AB.
PERPENDICULAR BISECTOR
If a perpendicular divides another line into two equal parts then it is said to be a
perpendicular bisector of that line.
Here, CD is the perpendicular bisector of AB as it divides AB into two equal parts

i.e. AD = DB.
NCERT EXERCISE: 5.4

Try these…
Q1. A segment AB is divided by a perpendicular bisector, as shown in the

picture. The perpendicular bisector crosses the segment at point C. If it is 3.5
inches from point A to point C, how long is the entire segment?
(a)7 inches
(b)3.5 inches
(c)6 inches
(d)9 inches
CLASSIFICATION OF TRIANGLES
Desmos Activity:
https://
teacher.desmos.com/activitybuilder/custom/57585f199f161519064f
f694?collections=featured-collections%2C5e6fe60ba5ff3e0aca46ba6a
Geogebra Activity:
https://www.geogebra.org/search/types%20of%20triangles
Based on Measure of Sides:
Based on Measure of Angles:
NCERT EXERCISE: 5.6

HW: Q2
POLYGONS AND QUADRILATERALS
https://
www.chalopadho.com/t/classroom/1127/chapter/92?topic=10946&show_whic
h=none
Please refer to the handout.

3D SHAPES
Some 3D shapes around us:

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UNDERSTANDING

Let’s get used to some geometry tools:

NCERT EXERCISE: 5.1

Click on the link above to play a quiz!!

TIME ANGLE / REVOLUTION TIME ANGLE / REVOLUTION

3 Hrs 90 / (1/4) 15 Mins 90 / (1/4)

6 Hrs 180 / (2/4) 30 Mins 180 / (2/4)

9 Hrs 270 / (3/4) 45 Mins 270 / (3/4)

12 Hrs 360 / (4/4) 60 Mins- 1 360 / (4/4)

NCERT EXERCISE: 5.2

NCERT EXERCISE: 5.2

An angle is measured in the “degree”. One complete revolution is divided into

NCERT EXERCISE: 5.4

Exercise 5.4: Q11

Here AB and MN are intersecting at point N and form a

Here, CD is the perpendicular bisector of AB as it divides AB into two equal parts

NCERT EXERCISE: 5.4

Q1. A segment AB is divided by a perpendicular bisector, as shown in the

NCERT EXERCISE: 5.6

Please refer to the handout.

Some 3D shapes around us:

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