An introduction to Trigonometry.

Tuesday, March 10, 2026 3:42 PM




Category Identity / Formula Notes / Usage
The Map Pythagoras (Radius is always
positive)
The Map Opposite/ Hypotenuse



The Map Adjacent/ Hypotenuse



The Map Slope



Quotient Use to simplify fractions


Square The "God" Identity


Square Derived from above

Square Derived from above

Double Angle Expanding a double angle


Double Angle Version 1


Double Angle Version 2 (Best for Half-Angles)


Double Angle Version 3 (Best for Half-Angles)


Compound Watch the signs


Compound Sign flips in the middle



Quadrant Angle Range Coordinates Positive Ratio
Q1 ALL ( )




TRIGONOMETRY Page 1