j. Table 4-2 shows the relationship of the sign, the function, and the quadrant of an angle.

given angle are represented by the lengths of the lines. This is illustrated for a second-quadrant angle in

Figure 4-16.

oblique triangles. To solve these triangles, the fundamental principles of the functions of angles greater

than 90€ must be understood. The functions of angles greater than 90€ can be expressed as the functions

of acute angles. These acute angles are found by subtracting the given angle from-

180 for quadrant II.

270€ for quadrant III.

360€ for quadrant IV.