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What is the length of BC?please help!!!

What is the length of BC?please help!!!
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What is the length of BC?please help!!!

What is the length of BC?please help!!!-example-1
asked
User Xwild
by
6.9k points

1 Answer

3 votes

Answer:

2.1

Explanation:

using cosine theorem or substraction of two vector

b = AC = 5

c = AB = 6

a² = b² + c² - 2bc cos A

a² = 5² + 6² - 2*5*6 cos 20°

a² = 4.62

a = √4.62

a = 2.149

a ≈ 2.1

answered
User Harriyott
by
9.0k points
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