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Ne4ueva [31]
4 years ago
13

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

Mathematics
1 answer:
Serga [27]4 years ago
3 0

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 significant figures )

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