# Maths - Trigonometry

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• Created by: Katie
• Created on: 08-05-13 19:35

Trigonometry

Finding missing angles

• The hypontenuse is the longest side of the triangle
• The opposite side is opposite to the angle we wish to work with
• The adjacent side is the one next to the angle that we are working with

If we know any two sides of a triangle we can use this theory to work out a missing angle.

Using S=O/H C=A/H T=O/A (SOHCAHTOA)  remember that whatever sides you have determine which you use, SINE, COSINE OR TANGENT.

For example, if you have the opposite and hypotenuse you need to your SINE.

If you have two sides you must use Sin (to the -1) this gets you to tell you the angle if you tell it the sine of the angle. In order to do this you must press 2nd function or shift and then SIN button followed by whatever number the opposite side divided by the hypotenuse is. FOR EXAMPLE:

If the opposite length is 3 and the hypotenuse is 5. Then you do 3/5 = 0.6 and then type SIN(TO THE -1)0.6 and you will find out the missing angle measurment.

STEP