Explain how to find the exact value of sec 13pi/4, including quadrant location.

First of all, let's convert this angle from radians to degree, so applying rule of three:



So we can represent this angle as follows:



One complete turn equals 360°, so if a point is traveling in a circumference, the position of the point in 585° is the same as in the angle of 225°. In this way, we also know the following regarding quadrants:



Given that 225° is between 180° and 270° then the conclusion is that this angle is in the III Quadrant and we can find the value as follows: