
#1
Dec2512, 01:48 AM

P: 16

We all know that
sin theta = opposite side / hypotenuse cos theta = adjacent side / hypotenuse tan theta = opposite side / adjacent side. But why? Are there some explanations behind or are they just defined by scientists? 



#2
Dec2512, 03:23 AM

Sci Advisor
P: 779

To answer the question, they are the definitions used in planar geometry. There are other (equivalent) ways of defining them, but you'll get the same properties nonetheless. 



#3
Dec2512, 03:34 AM

P: 16

How can one prove that sin theta = opposite side / hypotenuse ?




#4
Dec2512, 04:08 AM

Sci Advisor
P: 779

basic trigonometry
I guess it's worth asking: what is your definition of sine? 



#5
Dec2512, 04:12 AM

Mentor
P: 16,698





#6
Dec2512, 04:24 AM

Sci Advisor
P: 779

Where's the brainfart smiley when you need one? 


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