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

Find the lenght of side BC. give your answer to 3 significant figures-example-1
User Fudy
by
9.1k points

1 Answer

5 votes

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 )

User Brian Douglas
by
8.5k points

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