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Alex Ar [27]
3 years ago
5

Please help will mark brainliest!!!

Mathematics
2 answers:
nydimaria [60]3 years ago
8 0

Answer:

20

Step-by-step explanation:

PSYCHO15rus [73]3 years ago
4 0

Answer:

BC≈ 14.4 to the nearest tenth.

Step-by-step explanation:

To solve this, we are going to use the cosine formula;

a² = b² + c² - 2bc cos A

a=BC and it is what we are looking for, A= 91°   b=AC=13  and c=AB=6

We can now proceed and substitute the values into our formula;

a² = b² + c² - 2bc cos A

a² = 13² + 6² - 2(13)(6) cos 91

    = 169 + 36 -156 cos91

     =205 - 156(-0.01745)

    = 205 + 2.7222

     =207.7222

a²  =  207.7222

Take the square root of both-side to get the value of a

√a²  =  √207.7222

a=BC=14.41257

BC=14.41257

BC≈ 14.4 to the nearest tenth.

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