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What is an Angle? Video Lecture | Crash Course for Class 9 (English)
FAQs on What is an Angle? Video Lecture - Crash Course for Class 9 (English)
| 1. What is an angle? |  |
Ans. An angle is a geometric figure formed by two rays or lines that have a common endpoint called the vertex. It is usually measured in degrees or radians and represents the amount of rotation needed to bring one line into coincidence with the other.
| 2. How do you measure an angle? | |
Ans. Angles are measured using a protractor. To measure an angle, place the center of the protractor on the vertex of the angle. Then, align one side of the angle with the zero-degree mark on the protractor. Finally, read the measurement where the other side of the angle intersects the protractor.
| 3. What are the different types of angles? | |
Ans. There are several types of angles, including:
- Acute angle: An angle that measures less than 90 degrees.
- Right angle: An angle that measures exactly 90 degrees.
- Obtuse angle: An angle that measures greater than 90 degrees but less than 180 degrees.
- Straight angle: An angle that measures exactly 180 degrees.
- Reflex angle: An angle that measures greater than 180 degrees but less than 360 degrees.
| 4. How do you classify angles based on their measurements? | |
Ans. Angles can be classified into different categories based on their measurements. Here are some common classifications:
- Acute angle: Measures less than 90 degrees.
- Right angle: Measures exactly 90 degrees.
- Obtuse angle: Measures between 90 and 180 degrees.
- Straight angle: Measures exactly 180 degrees.
- Reflex angle: Measures between 180 and 360 degrees.
- Full angle: Measures exactly 360 degrees.
| 5. What is the difference between an acute angle and an obtuse angle? | |
Ans. The main difference between an acute angle and an obtuse angle is their measurements. An acute angle measures less than 90 degrees, while an obtuse angle measures greater than 90 degrees but less than 180 degrees. In simpler terms, an acute angle is "smaller" or "sharper" than a right angle (90 degrees), while an obtuse angle is "larger" or "more open" than a right angle.
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