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Understanding Elementary Shapes
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
(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 90⁰.
(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 360⁰.
(e) Sraight angle, as it measures 180º.
(f) Acute angle, as it measures less than 90⁰.
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