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pav-90 [236]
4 years ago
7

Helllppp plzzz.....​

Mathematics
2 answers:
Zina [86]4 years ago
8 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 )

Akimi4 [234]4 years ago
3 0

Answer:

BC= 19.4 (3s.f.)

Step-by-step explanation:

Since Angle CAB = 90

Therefore Angle ACB = 180° - 90° -71° = 19°

Using Sine Rule,

6.3cm/Sin(19°) = BC/Sin(90°)

BC= 19.350787697

= 19.4 cm (3 S.F.)

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