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3 years ago

11

Can it figure how to do this cosine out

1 answer:

Gnesinka [82]3 years ago

3 0

Answer:

BC= 14.6

Step-by-step explanation:

The law of cosines tells you ...

BC² = AB² +AC² -2·AB·AC·cos(A)

BC² = 9² +12² -2·9·12·cos(87°) ≈ 213.695

BC ≈√213.695 ≈ 14.6

The length of BC is about 14.6 units.

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