Find the lenght of side BC. give your answer to 3 significant figures

Question

asked Mar 14, 2021 36.0k views

1 Answer

Brian Douglas · Answer 1 · 2021-03-21T10:56:58+0000

Answer:

BC ≈ 19.4 cm

Explanation:

Using the cosine ratio in the right triangle

cos71° =
(adjacent)/(hypotenuse) =
(AB)/(BC) =
(6.3)/(BC) ( multiply both sides by BC )

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

BC =
(6.3)/(cos71) ≈ 19.4 cm ( to 3 significant figures )