范文：
Title: The English Term for "Angle"
The English term for "angle" is "angle." In mathematics and geometry, an angle is defined as the figure formed by two rays, called the sides of the angle, sharing a common endpoint, which is known as the vertex. Angles are typically measured in degrees, radians, or grads. Here are some common types of angles in English:
Acute angle: Less than 90 degrees.
Right angle: Exactly 90 degrees.
Obtuse angle: Between 90 and 180 degrees.
Straight angle: Exactly 180 degrees.
Reflex angle: Greater than 180 degrees but less than 360 degrees.
Full angle: Exactly 360 degrees.
Understanding the different types of angles is crucial in various fields, such as architecture, engineering, and design.
常见问答知识清单：
1. What is the English word for angle?
2. How do you measure an angle?
3. What is a right angle?
4. Can an angle be more than 360 degrees?
5. What is the difference between acute and obtuse angles?
6. How many degrees is a straight angle?
7. What is a reflex angle?
8. What is the smallest angle?
9. Can you have a negative angle?
10. How do you convert degrees to radians?
详细解答：
1. The English word for "angle" is "angle."
2. Angles are measured using a protractor, which can measure in degrees, radians, or grads.
3. A right angle is exactly 90 degrees.
4. Yes, an angle can be more than 360 degrees. This is known as a reflex angle, which ranges from 180 to 360 degrees.
5. Acute angles are less than 90 degrees, while obtuse angles are between 90 and 180 degrees.
6. A straight angle is exactly 180 degrees.
7. A reflex angle is an angle greater than 180 degrees but less than 360 degrees.
8. The smallest angle is an acute angle, which is less than 90 degrees.
9. In geometry, angles are typically measured in positive degrees, starting from 0 degrees. Negative angles are not commonly used in standard geometry but can be used in specific contexts, such as trigonometry.
10. To convert degrees to radians, you multiply the angle in degrees by π/180. For example, 90 degrees is equal to π/2 radians.
