472 Electrical Power Systems Technology
Figure A-1. Right
triangle illustrating
the trigonometric
relationships between
resistance, reactance,
and impedance in AC
circuits.Figure A-2. Illustration
of the trigonometric
relationships of the sides
of a right triangle to the
angle θ.Figure A-3. Standard graph illustrating how trigonometric functions for angles
greater than 90° (second-, third-, and fourth-quadrant angles) are derived by
converting to first-quadrant angles.