bbellag17 bbellag17

22-06-2020
Mathematics

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

what is the length of BCplease help class=

Respuesta :

masbrosur masbrosur

22-06-2020

Answer:

2.1

Step-by-step 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

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