In this unit of trigonometry we touched upon something called radian measure, which is completely different than degree measurement. For example instead of saying 180 degrees, it is now Ï€. Therefore if Ï€ = 180 degrees then it is also safe to say 90 degrees is equaled to Ï€/2. How do "Trigonometric Ratio's" relate to Special Triangles? We learned about the special triangles in grade 11 math. There are 3 types so far that we've learned, one with two 45 degrees angles and one 90 degree angle. Another one with a 90 degree angle, 60 degree angle, and a 30 degree, angle. The last one would be the same as the 2nd special triangle but flipped around.

Sin = y/r Secant = r/y

Cos = x/r Cosine = r/x

Tan = y/x Cotangent = x/y

the "r" value is determined by the hypotenuse of the special triangle, the "x" value goes by the x axis value, meaning the adjacent side of the special triangle, the "y" value goes by the y axis which is also the opposite side. Once you use these special triangles you can determine the Sin Cos Tan of the Radian Measure you had.

## Tuesday, November 10, 2009

### Trigonometric Ratios and Special Triangles

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