Understanding Elementary Shapes ( Exercise 5.3 )

 

Ex 5.3 Question 1.

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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  and  of a revolution.
                                               (f) One complete revolution.

Solution:
(i) Straight angle          ↔       (c) Half of a revolution.
(ii) Right angle             ↔       (d) One-fourth of a revolution.
(iii) Acute angle            ↔       (a) Less than one-fourth of a revolution.
(iv) Obtuse angle         ↔        (e) Between  and  of a revolution.
(v) Reflex angle            ↔        (f) One complete revolution, right, acute, obtuse or reflex.

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Ex 5.3 Question 2.

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Classify each one of the following angles

Solution:
(a) Acute angle
(b) Obtuse angle
(c) Right angle
(d) Reflex angle
(e) Straight angle
(f) Acute angle