Trigonometry is the branch of mathematics that studies angles, triangles, and relationships such as sine, cosine, and tangent. These functions connect an angle to ratios between the sides of a right triangle and also describe repeating patterns such as waves.
In cyber security, trigonometry is not usually a direct defensive technique, but it can support fields that rely on geometry and signal analysis, including computer graphics, robotics, and some forms of communications engineering. In practical computing, it may appear in software that calculates rotations, movement, or signal behavior. The article context mentions trigonometry in connection with slide-rule calculations, but does not specify a particular method. As with any technical calculation, understanding the relationships behind a result helps people recognize implausible outputs rather than trusting a tool blindly.