The diagram for this problem is shown below. As you can see, we have a reference angle:
[tex]\theta=71^{\circ}[/tex]
And an adjacent side that measures:
[tex]ab=6,3[/tex]
Therefore, by CAH we can find side bc:
[tex]cos(\theta)=\frac{Adjacent \ side}{Hypotenuse}=\frac{ab}{bc} \\ \\ bc=\frac{ab}{cos(\theta)} \\ \\ bc=\frac{6.3}{cos(71^{\circ})} \\ \\ bc=\frac{6.3}{0.33} \\ \\ \boxed{bc=19.35}[/tex]
Answer:
for the full mark you needs to be 19.4
Step-by-step explanation:
almost you got the full mark.
