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Trigonometry: It is the branch of math which deals with the measurement of angles and the problems allied with angles.
Trigonometric ratio of an acute angle of a right triangle:
let angle BAC=Ф be an acute angle of a right angled triangle ABC
in right angled ΔABC let
base = ab=x unit 
perpendicular= bc = y units
and hypotunious = AC = r units 

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