Unit Circle and Trigonometric Functions
The first page introduces the circonferenza goniometrica, or unit circle, and its key properties. The unit circle is centered at the origin 0,0 with a radius of 1. It demonstrates the relationship between angles and their sine and cosine values.
Definition: The unit circle is a circle with a radius of 1 centered at the origin of a coordinate system.
The page illustrates how angles are measured counterclockwise from the positive x-axis. It shows key angles in both degrees and radians, such as 30°, 45°, 60°, 90°, 180°, 270°, and 360°.
Highlight: The sine of an angle is the y-coordinate on the unit circle, while the cosine is the x-coordinate.
The page also includes formulas for converting between degrees and radians:
Example: To convert from degrees to radians: α = 2π∗x / 360
To convert from radians to degrees: α = 360∗x / 2π
Lastly, it provides a visual representation of sine, cosine, and tangent in relation to a right-angled triangle within the unit circle.