In other words, an angle measuring between 0° to 90° is called an acute angle. ∠ABCin the given figure is an acute angle.

You are watching: An angle that measures between 90 and 180 degrees


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

2. Right Angle:

An angle whose measure is 90° is called right angle.

In other words, an angle which measure exactly 90° is called a right angle.

Twolines that meet at a right angle are called perpendicular lines.


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In the above figure, ∠AOB is a right angle. In this case,we say that the arms OA and OB are perpendicular to each.

Therefore, ∠AOB shown in adjoining figure is 90°. So, ∠AOB is a right angle.

3. Obtuse Angle:

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

In other words, an angle measuring between 90° to 180° is called an obtuseangle.


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∠DOQ shown in the above figure is an obtuse angle.

4. Straight Angle:

An angle whose measure is 180° is called a straight angle.

In other words, an angle which measures exactly 180° is called a straightangle.


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∠XOY 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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∠AOB shown in the above figure is 210°. So, ∠AOB is a reflex angle.

6. Zero Angle:

An angle measure 0° is called a zero angle.


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 degreemeasure of another angle is a greater angle. Thus, we can say that:

Acute Angle Questions and Answers on Types of Angles:

I. Classify the given angles as acute, obtuse, right andstraight.

(i) 158°

(ii) 90°

(iii) 36°

(iv) 180°

(v) 91°

Answers:

(i) Obtuse Angle

(ii) Right Angle

(iii) Acute Angle

(iv) Straight Angle

(v) Obtuse Angle

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.

5th Grade Geometry

5th Grade Math ProblemsFrom Types of Angles to HOME PAGE


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