Triangles

Right Triangles

Pythagorean Theorem

Basic trig ratios

Keep in mind that you can re-arrange these.  You can also choose the other angle to be “Angle,” but remember to swap the adj and opp.

Inverse Trig Ratios

All Triangles

180° Rule

• Sum of the interior angles is 180°

Law of Sines

Law of cosines

If you are consistent in matching angles with their opposite sides, any side can be C.

Quadratic Equations

Put quadratics into this form:

Solve by

• Factoring
• Completing the Square (video)
• Quadratic Formula (calculator)

Simultaneous Equations

Substitution

Cramer’s Rule

• Cramer’s Rule Calcualtor (2 equations)
• Cramer’s Rule Calculator (3 equations)