Directions: Find the measure of the following angles and classify each angle according
to its measure.
Measurement
Classification of angle
1.
DRA
2.
BRC
3.
ARE
4.
DRB
5.
BRE
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Answers
An angle whose measure is equal to 90° is called a right angle. In the adjoining figure ∠ABC represents a right angle.
Right Angle
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∠ABC = 90°
Obtuse Angle:
An angle whose measure is more than 90° but less than 180° is called an obtuse angle. In the adjoining figure, ∠XYZ represents an obtuse angle.
Obtuse Angle
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∠XYZ > 90°
∠XYZ < 180°
Straight Angle:
An angle whose measure is equal to 180° is called a straight angle. In the adjoining figure, ∠XOY represents a straight angle.
Straight Angle
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∠XOY = 180°
Reflex Angle:
An angle whose measure is more than 180° but less than 360° is called a reflex angle. In the adjoining figure, ∠POQ is a reflex angle. Angles having magnitudes 220°, 250°, 310° are all reflex angles.
Reflex Angle
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∠POQ > 180°
∠POQ < 360°
Complete Angle:
An angle whose measure is equal to 360° is called a complete angle. In the adjoining figure, ∠BOA represents a complete angle.
60 minutes = 1 revolution = 1 complete angle.
Complete Angle
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These are the adjoining figures of the classification of angles on the basis of their degree measures