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Answer :
(i) Straight angle \(\rightarrow \) (c) Half of a revolution.
(ii) Right angle \(\rightarrow \) (d) One-fourth of revolution.
(iii) Acute angle \(\rightarrow \) (a) Less than one-fourth of a revolution.
(iv) Obtuse angle \(\rightarrow \) (e) Between 14 and 12 of a revolution.
(v) Reflex angle \(\rightarrow \) (f) One complete revolution, right, acute, obtuse or reflex.