By: Forrest Langley

 In order to solve triangles, you must use Sine, Cosine, and Tangent  Sinx= Opposite/Hypotenuse  Cosx= Adjacent/Hypotenuse  Tanx= Opposite/Adjacent

 To find Angle you must have at least two sides  To find Sides, you must have an angle and another side. Cannot use 90° angle.

9 16 X 1.Use Cosine because the numbers are adjacent and on the hypotenuse. 2.cosA= (9/16). 3.Divide by cos on both sides, cancels it out on left side. Dividing by cos is like multiplying by inverse. 4.A= cos -1 (9/16) 5.Enter in calculator (make sure it’s in Degree mode). 6.A= 55.6°

X 14 40° 1.Use sine because they are opposite and on the hypotenuse 2.Sin40= (14/X) 3.When the number is above the X, multiply across the equals sign. 4.Enter (14)sin40 into calculator 5.X= 9

X 15 30° 1.Use tan because they are opposite and adjacent 2.Tan30= (X/15) 3.Multiply both sides by 15, canceling it out on the right side. 4.(15)tan30=X 5.Enter in calculator 6.X= 8.7

X Solve for B:

20 X 15.6 Solve for A:

65° X 12.3 Solve for side AB:

X 17 41° Solve for side AC: