## NCERT Class 6 Mathematics Fifth Chapter Understanding Elementary Shapes Exercise 5.4 Solutions

## EXERCISE 5.4

**(1) What is the measure of**

(i) A right angle? = 90^{o}

(ii) A straight angle? = 180^{o}

**(2) Say True or False:**

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

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

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

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

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

**(3) Write down the measures of **

(a) Some acute angles. = 23° and 89°

(b) Some obtuse angles. = 91° and 179°

**(4) Measure the angles given below using the Protractor and write down the measure.**

**(5) Which angle has a large measure? First estimate and then measure.**

Measure of Angle A = 45°

Measure of Angle B = 60°

Angle B is greater than angle A.

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

Ans: 2nd figure is larger than 1st figure.

**In case you are missed :- Previous Chapter Exercise Solution**

**(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 __acute__.

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

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

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

(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 __an obtuse angle__.

**(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).**

**(9) Find the angle measure between the hands of the clock in each figure:**

**(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?**

**(11) Measure and classify each angle:**

**In case you are missed :- Next Chapter Exercise Solution**