Mathematic

Pythagoras theorem

A starter for beginners of trigonometry Suppose we measure the lengths of the sides of this triangle. Here are some realistic values: This would mean that:                       sin(A) = opposite / hypotenuse                    

                                = 4.00 cm / 7.21 cm

                                     = 0.5548

Or simply:                 sin(A) = 0.5548

Now for the other two trig functions.The value for the cosine of angle A is defined as the value that you get when you divide the adjacent side by the hypotenuse. This can be written:cos(A) = adjacent / hypotenuseOr:cos(A) = adj / hypOr:cos(A) = a / hUsing the above measured triangle, this would mean that:cos(A) = adjacent / hypotenuse = 6.00 cm / 7.21 cm = 0.8322Or simply:

cos(A) = 0.8322

trig vidwe found this useful …enjoy

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