PLEASE HELP! Trigonometry question :(

Answer:
see explanation
Step-by-step explanation:
Using the sine ratio
sinA = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{k}{c}[/tex]
sinC = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{k}{a}[/tex]