# Ncert Solutions For Class 6 Maths Ex 5.4

## Ncert Solutions For Class 6 Maths Chapter 5 Ex 5.4

Question 1:

Measure the following:

(i) A right angle

Ans. Right angle measures $$90^{\circ}$$

(ii) A straight line

Straight line measures $$180^{\circ}$$

Question 2:

State whether the following are True or False:

(i) Acute angle measures less than $$90^{\circ}$$.

True

(ii) Obtuse angle measures less than $$90^{\circ}$$.

False

Obtuse angle measures greater than $$90^{\circ}$$.

(iii) Reflex angle measures greater than $$180^{\circ}$$

True

(iv) One complete revolution measures $$360^{\circ}$$.

True

(v) If $$n\angle x$$ = $$54^{\circ}$$ and $$m\angle y$$ = $$36^{\circ}$$, then $$n\angle x$$ is greater than $$m\angle y$$.

True

Question 3:

Give the measures for the following:

(i) Acute angles

$$30^{\circ}$$.

$$80^{\circ}$$.

(ii) Obtuse angles

$$120^{\circ}$$.

$$150^{\circ}$$.

Question 4:

Using protractor measure the given and note them down.

$$40^{\circ}$$.

$$130^{\circ}$$.

$$90^{\circ}$$.

$$60^{\circ}$$, $$150^{\circ}$$ and $$75^{\circ}$$.

Question 5:

Measures the largest angle and find their angles.

A measures $$40^{\circ}$$.

B measures $$60^{\circ}$$.

$$\angle A$$ has the largest angle.

Question 6:

Measure the largest angle and find their angles.

Answer: The angles measure $$75^{\circ}$$ and $$70^{\circ}$$.

Hence, the first angle is greater.

Question 7:

Fill in the following:

(i) An angle which is less than $$90^{\circ}$$ is _________

Acute angle

(ii) An angle which is greater than $$90^{\circ}$$ is ________

Obtuse angle

(iii) An angle which is sum of two right angle is __________

Straight Angle

(iv) If sum of two angles is $$90^{\circ}$$, then each of the individual angle is ________

Acute angle.

(v) If sum of two angles is $$180^{\circ}$$ and one angle is obtuse, then the other angle is ________

Acute angle

Question 8:

Using protractor measure the following:

The angle measures

(i) $$30^{\circ}$$.

(ii)$$120^{\circ}$$.

(iii) $$60^{\circ}$$.

(iv) $$180^{\circ}$$.

Question 9:

What is the angle between the two hands of the clock?

(i) $$90^{\circ}$$.

(ii) $$30^{\circ}$$.

(iii) $$180^{\circ}$$.

Question 10:

The measure of the angle is $$45^{\circ}$$. Looking through a magnifying glass, does the angle becomes larger? Do the size increases?

The angle does not change.

Question 11:

Measure and identify the following:

 Angle Measure Type $$\angle XOY$$ – – $$\angle XOZ$$ – – $$\angle YOZ$$ – – $$\angle NOZ$$ – – $$\angle NOX$$ – – $$\angle NOY$$ – –

 Angle Measure Type $$\angle XOY$$ $$50^{\circ}$$. Acute $$\angle XOZ$$ $$130^{\circ}$$. Obtuse $$\angle YOZ$$ $$80^{\circ}$$. Acute $$\angle NOZ$$ $$100^{\circ}$$. Obtuse $$\angle NOX$$ $$145^{\circ}$$. Obtuse $$\angle NOY$$ $$180^{\circ}$$. Straight