Pythagoras' Theorem

Note: Don't forget to square-root!

Sin, Cos, Tan

Notes:

1. Ways to remember:

• SOH-CAH-TOA
• Silly Old Horses Chase After Hens That Offer Advice
• Formula Triangles

2. Sin, Cos and Tan are always with an angle.

3. If you're looking for an angle you need to use the inverses - sin^-1, cos^-1, tan^-1,