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2 years ago

CAN SOMEONE HELP ME

Mathematics

1 answer:

andre [41]2 years ago

4 0

Answer:

a ≈ 4.9

Step-by-step explanation:

using the Cosine Rule in Δ ABC

a² = b² + c² - (2bc cosA )

= 16² + 18² - (2 × 16 × 18 × cos15° )

= 256 + 324 - (576cos15° )

= 580 - 576cos15

= 23.6267 ( take square root of both sides )

a = $\sqrt{23.6267}$

≈ 4.9 ( to the nearest tenth )

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