Please help I don't understand. I will give brainlist!

Answer:
[tex]Sin A = \frac{a}{c}\\\\Cos A = \frac{b}{c} \\\\Tan A = \frac{a}{b} \\\\\\Sin B = \frac{b}{c} \\\\Cos B = \frac{a}{c}\\\\Tan B =\frac{b}{a}[/tex]
Formulas
[tex]Sin\theta = \frac{Opposite}{Hypotenuse}\\\\Cos\theta = \frac{Adjacent}{Hypotenuse} \\\\Tan \theta =\frac{Opposite}{Adjacent}[/tex]