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Chapter 5 Understanding Elementary Shape Ex 5.3 Solutions

Question - 1 : -
Match the following:

(i) Straight angle (a) Less than one-fourth of a revolution

(ii) Right angle (b) More than half a revolution

(iii) Acute angle (c) Half of a revolution

(iv) Obtuse angle (d) One-fourth of a revolution

(v) Reflex angle (e) Between 1 / 4 and 1 / 2 of a revolution

(f) One complete revolution

Answer - 1 : -

(i) Straight angle = 1800 or half of a revolution

Hence, (c) is correct answer

(ii) Right angle = 900 or one-fourth of a revolution

Hence, (d) is correct answer

(iii) Acute angle = less than 900 or less than one-fourth of a revolution

Hence, (a) is correct answer

(iv) Obtuse angle = more than 900 but less than 1800 or between 1 / 4 and 1 / 2 of a revolution

Hence, (e) is correct answer

(v) Reflex angle = more than 1800 but less than 3600 or more than half a revolution

Hence, (b) is correct answer

Question - 2 : -  Classify each one of the following angles as right, straight, acute, obtuse or reflex:

Answer - 2 : -

(i) The given angle is acute angle it measures less than 900

(ii) The given angle is obtuse angle as it measures more than 900 but less than 1800

(iii) The given angle is right angle as it measures 900

(iv) The given angle is reflex angle as it measures more than 1800 but less than 3600

(v) The given angle is straight angle as it measures 1800

(vi) The given angle is acute angle as it measures less than 900

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