How to calculate the tangent of an angle how to calculate the tangent of an angle related book pre calculus for dummies 2nd edition by yang kuang elleyne kase because a lot of pre calculus work involves trigonometric functions you need to understand ratios one important ratio in right triangles is the tangent. Use your calculator to find the inverse tangent of the result from step 4 to calculate the angle measurement on many calculators you can use the inverse tangent function by hitting 2nd and then tan finishing this example the inverse tangent of 1333 equals about 5313 meaning the unknown angle is 5313 degrees. Finding an angle in a right angled triangle angle from any two sides for cosine calculate adjacent hypotenuse or for tangent calculate opposite adjacent step 4 find the angle from your calculator using one of sin 1 cos 1 or tan 1 examples. Sine cosine and tangent sine cosine and tangent often shortened to sin cos and tan are each a ratio of sides of a right angled triangle for a given angle each ratio stays the same no matter how big or small the triangle is to calculate them divide the length of one side by another side
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