NCERT Solutions Class 6 Mathematics Understanding Elementary Ex 5.4

Answer :

(a) 40°

(b) 130°

(c) 90°

(d) 60°

Question: 5.Which angle has a large measure? First estimate and then measure:
Measure of angle A =

Measure of angle B =

Answer :
∠B has larger measure.
∠A = 40° and ∠B = 65°

Question: 6.From these two angles which has larger measure? Estimate and then confirm by measuring them:

Answer :
Second angle has larger measure.

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 ________________.

Answer :
(a) acute angle, (b) obtuse angle, (c) straight angle, (d) acute angle, (e) obtuse angle

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).

Answer :

(i)30°
(ii) 120°
(iii) 60°
(iv) 150°

Question: 9.Find the angle measure between the hands of the clock in each figure:

Answer :

(i)90° (Right angle)

(ii) 30° (Acute angle)

(iii) 180° (Straight angle)

Question: 10.Investigate:
In the given figure, the angle measure 30°. Look at the same figure through a magnifying glass. Does the angle becomes larger? Does the size of the angle change?

Answer :
No, the measure of angle will be same.

Question: 11.Measure and classify each angle:

Answer :

Sol.