Mathematics Class 6 NCERT Solutions: Chapter 5 Understanding Elementary Shapes Exercise 5.4 – Part 1

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Types of angle are given in image

Types of Angle Are Given in Image

Types of angle are given in image

Q.1 What is the measure of (i) a right angle? (ii) a straight angle?

(i) a right angle?

Answer:

A right angle is an angle of exactly (degrees), corresponding to a quarter turn.

Image of Measure of Right Angle

Image of Measure of Right Angle

Image of Measure of Right Angle

(ii) a straight angle?

Answer: A straight angle is an angle of .

Image of Measure of Straight Angle

Image of Measure of Straight Angle

Image of Measure of Straight Angle

Q. 2 Say True or False:

(a) The measure of an acute angle

Answer: True

(b) The measure of an obtuse angle .

Answer: False

(c) The measure of an reflex angle .

Answer: True

(d) The measure of on complete revolution .

Answer: True

(e) If .

Answer: True

Q. 3 Write down the measure of:

(a) Some acute angles

Answer:

(b) Some obtuse angles

Answer:

Q. 4 Measure the angles given below, using the protractor and write down the measure:

(a)

Image of 40° Angle

Image of 40° Angle

Image of 40° Angle

Answer:

(b)

Image of Image of 130° Angle

Image of Image of 130° Angle

Image of Image of 130° Angle

Answer:

(c)

Image of Image of 90° Angle

Image of Image of 90° Angle

Image of Image of 90° Angle

Answer:

(d)

Image of Image of 60° Angle

Image of Image of 60° Angle

Image of Image of 60° Angle

Answer:

Q.5 which angle has a large measure? First estimate and then measure:

(a) Measure of angle A =

Image of Measure of angle A = 40°

Image of Measure of Angle a = 40°

Image of Measure of angle A = 40°

Answer:

(b) Measure of angle B =

Image of Measure of angle B = 65°

Image of Measure of Angle B = 65°

Image of Measure of angle B = 65°

Answer:

Has larger measure.