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Trigonometry Textbook

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$\def\D{\displaystyle}\def\cosec{\mbox{cosec }}$ ​ေထာင္​့မွန္​ တရိဂံ $\D ABC$ တြင္​ $\D C$ သည္​ ​ေထာင္​့မွန္​ျဖစ္​ၿပီး ​ေထာင္​့ $\D A$ ၏ တန္​ဘိုးသည္​ $\theta$ ျဖစ္​ပါ​ေစ။ $AB$ ကို ​ hypotenuse, ​(ေထာင္​့မွန္​ခံအနား) $AC$ ကို adjacent, (နီးစပ္​အနား ) $BC$ ကို opposite (မ်က္​ဆိုင္​အနား) ဟု အသီးသီး​ေခၚပါ။ ​ေထာင္​့ $\theta$ အတြက္​ trigonometric ratio မ်ားကို ​ေအာက္​ပါ အတိုင္​း သတ္​မွတ္​ပါသည္​။ $\D \begin{array}{|lrcl|}\hline \mbox{Sin of }\theta:&\sin\theta&=&\frac{BC}{AC}\\ \mbox{Cosin of }\theta:&\cos\theta&=&\frac{AB}{AC}\\ \mbox{Tangent of }\theta:&\tan\theta&=&\frac{BC}{AB}\\ \mbox{Cotangent of }\theta:&\cot\theta&=&\frac{AB}{BC}\\ \mbox{Secant of }\theta:&\sec\theta&=&\frac{AC}{AB}\\ \mbox{Cosecant of }\theta:&\cosec\theta&=&\frac{AC}{BC}\\ \hline \end{array} $ အထက္​​ေဖာ္​ျပပါ အခ်ိဳး မ်ားကို six trigonometric ratios (ႀထိိဂို နို​ေမႀထီ ဆိုင္​ရာ အခ်ိဳး  ၆ မ်ိဳး ) ဟု​ေခၚပါသည္​။