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PLEASE HELP!!! b=7,c=10, COS A = 40°, a=____
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1 vote
PLEASE HELP!!!

b=7,c=10, COS A = 40°, a=____

User Imrana
by
6.7k points

1 Answer

3 votes

Explanation:

According to the cosine rule :

a = b² + c² - 2bc × cosA

a = 7² + 10² - 2 × 7 × 10 × cos40⁰

a = 49 + 100 - 106.4

a = 149 - 106.4

a = 43.4

User John Rocha
by
7.0k points
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