Right Triangles:

Special Angles (i) 0 / 90 deg, (ii) 45⁰ / 45⁰ (iii) 30⁰ / 60⁰
 

	½
			1
		½

Right Triangles:  Rations of Sides:

, r² = x² + y²

Non-Right Triangles: Law of Cosines:

   and   

Non-Right Triangles: Law of Sines:

Perpendicular of a non-right triangle, h

Some Trigonometry Identities (more Trigonometric Identities)
 

Solve trigonometric functions between  - Note Quadrant and +/- sign of function;
or find values for x, y, and r and solve: