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

(a) Acute. (b) Obtuse. (c) Right. (d) Reflex. (e) Straight. (f) Acute, acute.

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  $\frac{1}{4}$  and  $\frac{1}{2}$  of a revolution (f) One complete revolution

(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    (b) More than half a revolution
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