branch of mathematics that studies triangles, the relationships
between their sides, and the angles between these sides. Trigonometric
functions are often used to describe these relationships.
has many fundamental applications, including angles, rotations, and more (e.g.,
a right triangle as below:
- The longest side is called the hypotenuse, and
is opposite the right angle.
- For an angle other than the right angle,
we can define adjacent and opposite