Chapter - 5 Understanding Elementary Shapes

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Q
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 1/4 and 1/2 of a revolution

                                 (f) One complete revolution

Solution: 

(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 1/4 and 1/2 of a revolution

(v) Reflex angle        (f) One complete revolution

 

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

Solution: (a) Acute angle, as it measures less than 90โฐ.

(b) Obtuse angle, as it measures more than 90° but less than 180º.

(c) Right angle, as it measures 90º.

(d) Reflex angle, as it measures more than 180° but less than 360โฐ.

(e) Sraight angle, as it measures 180º.

(f) Acute angle, as it measures less than 90โฐ.

                                 

Answer:


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