Class 9 > Mathematics (Maths) Class 9 > Types of Angles
Types of Angles Video Lecture - Mathematics (Maths) Class 9
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42 videos|378 docs|65 tests
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FAQs on Types of Angles Video Lecture - Mathematics (Maths) Class 9
| 1. What are the different types of angles? |  |
Ans. There are several types of angles, including:
- Acute angles: These angles measure less than 90 degrees.
- Obtuse angles: These angles measure more than 90 degrees but less than 180 degrees.
- Right angles: These angles measure exactly 90 degrees.
- Straight angles: These angles measure exactly 180 degrees.
- Reflex angles: These angles measure more than 180 degrees but less than 360 degrees.
| 2. How can I identify if an angle is acute, obtuse, or right? | |
Ans. To identify the type of angle, you can measure its degree using a protractor. If the angle measures less than 90 degrees, it is acute. If it measures more than 90 degrees but less than 180 degrees, it is obtuse. If it measures exactly 90 degrees, it is a right angle.
| 3. Can an angle be both acute and obtuse? | |
Ans. No, an angle cannot be both acute and obtuse. An angle can only fall into one category at a time based on its degree measure. An acute angle measures less than 90 degrees, while an obtuse angle measures more than 90 degrees. They are mutually exclusive categories.
| 4. Are there any angles that measure exactly 180 degrees? | |
Ans. Yes, there are angles that measure exactly 180 degrees. These angles are called straight angles. A straight angle forms a straight line, and its degree measure is exactly 180 degrees. It is the largest possible angle in terms of degree measure.
| 5. What are examples of reflex angles? | |
Ans. Reflex angles are angles that measure more than 180 degrees but less than 360 degrees. Some examples of reflex angles include angles formed by hands on a clock when the time is between 6 and 12, angles in a triangle that exceed 180 degrees, or angles in irregular polygons with more than 180 degrees of total measure.
About this Video
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Indu Gupta |
Video Description: Types of Angles for Class 9 2023 is part of Mathematics (Maths) Class 9 preparation.
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Video Lecture & Questions for Types of Angles Video Lecture | Mathematics (Maths) Class 9 - Class 9 full syllabus preparation | Free video for Class 9 exam to prepare for Mathematics (Maths) Class 9.
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42 videos|378 docs|65 tests
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Timeline
| 00:03 | Introduction |
| 00:28 | Right Angle |
| 01:16 | Straight Angle |
| 01:58 | Acute Angle |
| 02:50 | Obtuse Angle |
| 03:11 | Reflex Angle |
| 04:07 | Types of Angles |
| 05:09 | Full Angle |
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