# Ncert Solutions For Class 6 Maths Ex 5.3

## Ncert Solutions For Class 6 Maths Chapter 5 Ex 5.3

Question 1:

Match the correct options

 A) Straight angle i) Less than one-fourth of a revolution B) Right angle ii) More than half a revolution C) Acute angle iii) Half of a revolution D) Obtuse angle iv) One-fourth of a revolution E) Reflex angle v) Between $$\frac{1}{4}$$ and $$\frac{1}{2}$$ of a revolution vi) One complete revolution

A) Straight angle — iii) Half of a revolution

Reason

$$180^{\circ}$$ is considered as a straight line and half of revolution is also $$180^{\circ}$$

B) Right angle — iv) One-fourth of a revolution

Reason

$$90^{\circ}$$ is considered as a straight line and half of revolution is also $$90^{\circ}$$.

C) Acute angle — i) Less than one-fourth of a revolution

Reason

The angle which is less than $$90^{\circ}$$ is called acute angle and also less than one-fourth of a revolution is the angle less than $$90^{\circ}$$

D) Obtuse angle — v) Between $$\frac{1}{4}$$ and $$\frac{1}{2}$$ of a revolution

Reason

The angle which is greater than $$90^{\circ}$$ and less than $$180^{\circ}$$ is called obtuse angle and also the value between $$\frac{1}{4}$$ and $$\frac{1}{2}$$ of a revolution also lies between $$90^{\circ}$$ and $$180^{\circ}$$

E) Reflex angle – ii) More than half a revolution

Reason

The angle which is greater than $$180^{\circ}$$ but less than $$360^{\circ}$$ is called reflex angle and also more than half a revolution is the angle whose measure is greater than $$180^{\circ}$$.

Question 2:

Classify the following angles as ( Right/Reflex/Obtuse/Acute)

a)

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

b)

Obtuse angle (greater than $$90^{\circ}$$ and less than $$180^{\circ}$$)

c)

Right angle (equals $$90^{\circ}$$)

d)

Reflex angle (greater than $$180^{\circ}$$ but less than $$360^{\circ}$$)

e)

Straight angle (equals $$180^{\circ}$$)

f)

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