# Types of Angles | Acute Angle | Right Angle | Obtuse Angle | Straight

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Types of angles are discussed here according to their degree measure.

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1. Acute Angle:

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An angle whose measure is less than 90° is called an acute angle.

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ÐMON shown in adjoining figure is equal to 60°. So, ÐMON is an acute angle.

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2. Right Angle: An angle whose measure is 90° is called right angle.

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In the above figure, ÐAOB is a right angle. In this case, we say that the arms OA and OB are perpendicular to each. Therefore, ÐAOB shown in adjoining figure is 90°. So, ÐAOB is a right angle. E-mail Address First Name Then

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3. Obtuse Angle: An angle whose measure is greater than 90° but less than 180° is called an obtuse angle.

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ÐDOQ shown in the above figure is an obtuse angle.

4. Straight Angle: An angle whose measure is 180° is called a straight angle.

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ÐXOY shown in the above figure is a straight angle. A straight angle is equal to two right angles.

5. Reflex Angle: An angle whose measure is more than 180° but less than 360° is called a reflex angle.

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ÐAOB shown in the above figure is 210°. So, ÐAOB is a reflex angle.

6. Zero Angle: An angle measure 0° is called a zero angle.

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When two arms of an angle lie on each other, 0° angle is formed.

Comparision of Angles An angle whose degree measure is greater than the degree measure of another angle is a greater angle. Thus, we can say that: Acute Angle < Right Angle < Obtuse Angle < Straight Angle < Reflex Angle.

l Angle. Interior and Exterior of an Angle. Measuring an Angle by a Protractor. Types of Angles. Pairs of Angles. Bisecting an angle. Construction of Angles by using Compass. Worksheet on Angles. Geometry Practice Test on angles.

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