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What is the answer to this bonus question? And I need a step by step explanation please

What is the answer to this bonus question? And I need a step by step explanation please-example-1
User Ben McRae
by
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1 Answer

3 votes

Answer:

Q = 9.1º

Explanation:

Law of Cosines

c² = a² + b² - 2ab * cosC

1.3² = 7² + 7.6² - 2(7)7.6 * cosQ

1.69 = 106.76 - 106.4 * cosQ

Subtract 106.76 from both sides

-105.07 = -106.4 * cosQ

Divide both sides by -106.4

0.9875 = cosQ

Q = arccos0.9875

Q = 9.068721546032704

Rounded

C = 9.1º

User Chinthana
by
5.0k points