Question

Find the length of side BC. Give your answer to 3 significant figures. C A 71° B

Answer 1

Answer:

19.4°

Step-by-step explanation:

I put the image of how I did it if you don't understand let me know

Answer 2

Answer:

BC ≈ 19.4 cm

Step-by-step explanation:

using the cosine ratio in the right triangle

cos71° = $\frac{adjacent}{hypotenuse}$ = $\frac{AB}{BC}$ = $\frac{6.3}{BC}$ ( multiply both sides by BC )

BC × cos71° = 6.3 ( divide both sides by cos71° )

BC = $\frac{6.3}{cos71}$ ≈ 19.4 cm ( to 3 sig. figs )