Tue July 03, 2012 By:

why there are only 6 trigonometric ratio?

Expert Reply
Tue July 03, 2012
Answer : The 6 trigonometric ratios are formed by taking all the possible ratios of the any two sides of a perpendicular triangle out of three sides.
In this given traingle RPQ, let us take angle RPQ as angle x, then to find the value of x, if we are provided with the size of any two sides, then using the appropriate trigonometric ratio, we can deduce the angle x and find other ratios thereafter. 
for eg : side RQ = 3 units , side PQ = 3 units , then as we have perpendicular side and base side, we use
tan x= RQ / PQ 
          = 3 / 3
          = 1 
x= 45 degree.
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