# Understanding Elementary Shapes

#### Question 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 of a revolution

(f) One complete revolution

#### Answer:

(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,…

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