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
of
a revolution
(f) One complete revolution
(i) Straight angle is of 180º and half of a revolution is 180º.
Hence, (i) ↔ (c)
(ii) Right angle is of 90º and one-fourth of a revolution is 90º.
Hence, (ii) ↔ (d)
(iii) Acute angles are the angles less than 90º. Also, less than one-fourth of a revolution is the angle less than 90º.
Hence, (iii) ↔ (a)
(iv) Obtuse angles are the angles greater than 90º but less than
180º. Also, between
of
a revolution is the angle whose measure lies between 90º and
180º.
Hence, (iv) ↔ (e)
(v) Reflex angles are the angles greater than 180º but less than 360º. Also, more than half a revolution is the angle whose measure is greater than 180º.
Hence, (v) ↔ (b)