## angle

### In mathematics, an angle is a geometric figure formed by two rays or lines that share a common endpoint, called the vertex

In mathematics, an angle is a geometric figure formed by two rays or lines that share a common endpoint, called the vertex. The rays extending from the vertex are referred to as the sides of the angle. Angles are typically measured in degrees, although they can also be measured in radians.

Here are some important terms related to angles:

1. Vertex: The shared endpoint of the two rays or lines that form an angle.

2. Sides: The two rays or lines that form an angle. They are also referred to as arms or legs of the angle.

3. Angle Measure: The magnitude or size of an angle, typically measured in degrees. In a standard position, where one side lies along the x-axis, angles are measured counterclockwise from the positive x-axis.

4. Degrees: The unit of measurement for angles. A full circle is divided into 360 degrees, with each degree further divided into minutes and seconds.

5. Radians: An alternative unit of measurement for angles, often used in advanced mathematics and physics. A radian is defined as the angle subtended at the center of a circle by an arc that is equal in length to the radius of the circle.

6. Acute Angle: An angle that measures less than 90 degrees.

7. Right Angle: An angle that measures exactly 90 degrees. One of its sides is perpendicular to the other.

8. Obtuse Angle: An angle that measures more than 90 degrees but less than 180 degrees.

9. Straight Angle: An angle that measures exactly 180 degrees. It forms a straight line.

10. Reflex Angle: An angle that measures more than 180 degrees but less than 360 degrees.

11. Complementary Angles: Two angles are complementary if the sum of their measures is equal to 90 degrees. For example, angles measuring 30 degrees and 60 degrees are complementary.

12. Supplementary Angles: Two angles are supplementary if the sum of their measures is equal to 180 degrees. For example, angles measuring 120 degrees and 60 degrees are supplementary.

Understanding angles and their properties is essential in various mathematical applications, such as geometry, trigonometry, and physics. They play a crucial role in determining shapes, measuring distances, and calculating the relationships between different objects or points.

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