Match the following:

(i) Straight angle     (a) less than one-fourth 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 a revolution

(v) Reflex angle      (e) between the end of a revolution

                                (f) One complete revolution

When two lines intersect at a point, the measure of the “opening” between these two lines is called an “Angle”

Answer: 

(i) Straight angle
(c) half of a revolution 

(ii) Right angle
(d) one-fourth a revolution

(iii) Acute angle 
(a) less than one-fourth a revolution

(iv) Obtuse angle 
(e) between the end of a revolution

(v) Reflex angle
(b) more than half a revolution 

Explanation:

(i) Straight angle is 180 degrees, hence 
(c) half of a revolution 

(ii) Right angle is 90 degrees, hence 
(d) one-fourth a revolution

(iii) Acute angle is less than 90 degrees, hence 
(a) less than one-fourth a revolution

(iv) Obtuse angle is more than 90 degrees, hence 
(e) between the end of a revolution

(v) Reflex angle is more than 180 degrees, hence 
(b) more than half a revolution 

Thus,

(i) Straight angle
(c) half of a revolution 

(ii) Right angle
(d) one-fourth a revolution

(iii) Acute angle 
(a) less than one-fourth a revolution

(iv) Obtuse angle 
(e) between the end of a revolution

(v) Reflex angle
(b) more than half a revolution