Basic Trigonometry We will be covering Trigonometry only as it pertains to the right triangle: Basic Trig functions:  Hypotenuse (H) Opposite (O) Adjacent (A) Remember: “SOH CAH TOA”

Basic Trigonometry (2) Let’s Practice this: For each triangle, find the unknown (?) side using your calculator. 57 (?) 38 30 55 45 4.50 30.0 7.60 10.0 25.0 42 9.80

Basic Trigonometry (3) Inverse Trig Functions Use when you don’t know the angle, but know any two sides.

Basic Trigonometry (3) Practice: Find the unknown angles (?) using inverse trig functions: (?) 35.0 16.0 3.80 12.0 3.50 4.50 30.0 7.60 10.0 25.0 11.5 9.80

Basic Trigonometry (4) Pythagorean Theorem H2 = O2 + A2 or Useful for finding the third side of a right triangle when the other two sides are known. So now, we can find any unknown side or angle of a right triangle using either trig functions (Sin, Cos, Tan), inverse trig functions, or the Pythagorean Theorem.