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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) On- fourth of a revolution(v) Reflex angle(e) Between 1/4 and 1/2 of a revolution(f) one complete revolution |
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Answer» (i) Straight angle is of 180° and half of a revolution is 180°. Hence. (i) – (c) (ii) Right angle is of 90° and one – fourth of a revolution is 90°. Hence, (ii) – (d) (iii) Acute angles are the angles less than 90°. Also, less than one fourth of a revolution is the angle less than 90°. Hence, (iii) – (a) (iv) Obtuse angles are the angles greater than 90° but less than 180°. Also between 1/4 and 1/2 of a revolution is the angle whose measure lies between 90° and 180°. Hence, (iv) – (e) (v) Reflex angles are the angles greater than 180° but less than 180° but less than 360°, Also more than half a revolution is the angle whose measure is greater than 180°. Hence (V) ⟷ (b) |
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