# Here we have given NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes Ex 5.4.

- Understanding Elementary Shapes Class 6 Ex 5.1
- Understanding Elementary Shapes Class 6 Ex 5.2
- Understanding Elementary Shapes Class 6 Ex 5.3
- Understanding Elementary Shapes Class 6 Ex 5.5
- Understanding Elementary Shapes Class 6 Ex 5.6
- Understanding Elementary Shapes Class 6 Ex 5.7
- Understanding Elementary Shapes Class 6 Ex 5.8
- Understanding Elementary Shapes Class 6 Ex 5.9

Board | CBSE |

Textbook | NCERT |

Class | Class 6 |

Subject | Maths |

Chapter | Chapter 5 |

Chapter Name | Understanding Elementary Shapes |

Exercise | Ex 5.4 |

Number of Questions Solved | 11 |

Category | NCERT Solutions |

## NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes Ex 5.4

Ex 5.4 Class 6 Maths Question 1.

What is the measure of

(i) a right angle?

(ii) a straight angle?

Solution:

(i) 1 right angle = 90°

(ii) 1 straight angle = 2 right angles = 2 x 90°=180°

Ex 5.4 Class 6 Maths Question 2.

Say True or False:

(a) The measure of an acute angle < 90°.

(b) The measure of an obtuse angle < 90°.

(c) The measure of a reflex angle > 180°.

(d) The measure of one complete revolution = 360°.

(e) If m∠A = 53° and m∠B = 35°, then m∠A > m∠B.

Solution:

(a) True

(b) False

(c) True

(d) True

(e) True

Ex 5.4 Class 6 Maths Question 3.

Write down the measures of

(a) some acute angles.

(b) some obtuse angles.

(give at least two examples of each).

Solution:

(a) Since the measure of an acute angle < 90°. So, two acute angles may be of 60° and 30°.

(b) Since the measure of an obtuse angle > 90°. So, two obtuse angles may be of 110° and 120°.

Ex 5.4 Class 6 Maths Question 4.

Measure the angles given below using the Protractor and write down the measure.

Solution:

On measuring the given angles using protractor, we find that

(a) 45°

(b) 125°

(c) 90°

(d) ∠1 = 40°, ∠2 = 125° and ∠3 = 95°.

Ex 5.4 Class 6 Maths Question 5.

Which angle has a large measure ? First estimate and then measure.

Measure of Angle A =

Measure of Angle B =

Solution:

Observing the given angles, we find that

∠B > ∠A

On measuring, we find that

Measure of Angle A =40°

Measure of Angle B = 65°

∴ ∠B > ∠A.

Ex 5.4 Class 6 Maths Question 6.

From these two angles which has larger measure? Estimate and then confirm by measuring them.

Solution:

On observing, we find that

∠B > ∠A

On measuring, we find that

∠A = 45° and ∠B =60°

Thus, ∠B > ∠A.

Ex 5.4 Class 6 Maths Question 7.

Fill in the blanks with acute, obtuse, right or straight:

(a) An angle whose measure is less than that of a right angle is ……. .

(b) An angle whose measure is greater than that of a right angle is ……… .

(c) An angle whose measure is the sum of the measures of two right angles is ……. .

(d) When the sum of the measures of two angles is that of a right angle, then each one of them is …… .

(e) When the sum of the measures of two angles is that of a straight angle and if one of them is acute then the other should be …… .

Solution:

(a) acute

(b) obtuse

(c) straight

(d) acute

(e) obtuse

Ex 5.4 Class 6 Maths Question 8.

Find the measure of the angle shown in each figure. (First estimate with your eyes and then find the actual measure with a protractor).

Solution:

On estimating without measuring, the measure of the angle shown in each figure is

(a) 45°

(b) 60°

(c) 125°

(d) 135°

On measuring with the protractor, we find their measures as under:

(a) 40°

(b) 65°

(c) 130°

(d) 135°

Ex 5.4 Class 6 Maths Question 9.

Find the angle measure between the hands of the clock in each figure:

Solution:

The angle measure between the hands of the clock in the time shown is as under:

At 9.00 a.m. : 90°

At 1.00 p.m. : 30°

At 6.00 p.m. : 180°

Ex 5.4 Class 6 Maths Question 10.

Investigate

In the given figure, the angle measures 30°. Look at the same figure through a magnifying glass. Does the angle becomes larger? Does the size of the angle change?

Solution:

Looking through a magnifying glass does not make the angle larger and so the size of the angle does not change.

Ex 5.4 Class 6 Maths Question 11.

Measure and classify each angle:

Solution:

The measure of angle and its classification is recorded in the given table as under:

We hope the NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes Ex 5.4 help you. If you have any query regarding NCERT Solutions for Class 6 Maths Chapter 5 Understanding Elementary Shapes Ex 5.4, drop a comment below and we will get back to you at the earliest.

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