These NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes InText Questions and Answers are prepared by our highly skilled subject experts.

## NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes InText Questions

NCERT In-text Question Page No. 88

Question 1.

Take any post card. Use the above technique to measure its two adjacent sides.

Answer:

Do it yourself.

Question 2.

Select any three objects having a flat top. Measure all sides of the top using a divider and a ruler.

Answer:

Do it yourself.

NCERT In-text Question Page No. 91

Question 1.

What is the angle name for half a revolution?

Answer:

∵ 2 straight angles = 1 revolution

∴ \(\frac { 1 }{ 2 }\) [2 straight angles] = \(\frac { 1 }{ 2 }\) [1 revolution]

or A straight angle = \(\frac { 1 }{ 2 }\) revolution

Thus, half a revolution means a straight angle.

Question 2.

What is the angle name for one-fourth revolution?

AnswerL

∵ 4 right angles = 1 revolution

∴ A right angle = \(\frac { 1 }{ 4 }\) revolution 4

Thus, one-fourth a revolution means a right angle.

Question 3.

Draw five other situations of one-fourth, half and three-fourth revolution on a clock.

Answer:

(i) One-fourth revolution [i.e. a turn of a right angle]

For one-fourth revolution, the clock hand moves from:

(a) 12 to 3

(b) 3 to 6

(c) 1 to 4

(d) 9 to 12

(e) 6 to 9

(ii) Half-revolution [i.e. a turn of a straight angle]

For a half-revolution, the clock hand moves from

(a) 12 to 6

(b) 3 to 9

(c) 1 to 7

(d) 2 to 8

(e) 4 to 10

(iii) Three-fourth revolution [i.e. a turn of 3 right angles ]

Note: There is no special name for three- fourth of a revolution.

For a three-fourth revolution, the clock- hand moves from:

(a) 12 to 9

(b) 1 to 10

(c) 3 to 12

(e) 9 to 6

NCERT In-text Question Page No. 93

Question 1.

The hour hand of a clock moves from 12 to 5. Is the revolution of the hour hand more than 1 right angle?

Answer:

Yes, the revolution of the hour hand from 12 to 5 is more than 1 right angle.

Question 2.

What does the angle made by the hour hand of the clock look like when it moves from 5 to 7. Is the angle moved more than 1 right angle?

Answer:

No, in this case the angle is less than a right angle.

Question 3.

Draw the following and check the angle with your RA tester.

(a) going from 12 to 2

(b) from 6 to 7

(c) from 4 to 8

(d) from 2 to 5

Answer:

(a) Going from 12 to 2: The angle formed by the hour hand in going from 12 to 2 is shown in the figure alongside. Checking this angle by RA [right angle] tester, we find that it is less than a right angle.

(b) Going from 6 to 7: Checking the angle formed by RA tester, we find

(c) Going from 4 to 8: Checking the angle so formed by RA tester, we find

(d) Going from 2 to 5: Checking the angle so formed by RA tester, we find

Question 4.

Take five different shapes with corners. Name the corners. Examine them with your tester and tabulate your results for each case:

Answer:

It is an activity. Do it yourself.

NCERT In-text Question Page No. 94

Question 1.

Look around you and identify edges meeting at corners to produce angles. List ten such situations.

Answer:

Do it yourself.

Question 2.

List ten situations where the angles made are acute.

Answer:

Do it yourself.

Question 3.

List ten situations where the angles made are right angles.

Answer:

Do it yourself.

Question 4.

Lind five situations where obtuse angles are made.

Answer:

Do it yourself.

Question 5.

List five other situations where reflex angles may be seen.

Answer:

Do it yourself.