Asked by Kanta
In a triangle, the three sides: BC = a = 8, AC = b = 6 and AB = c = 7. What is angle C in degrees? (give your answer to 1 decimal place)!!!
Answers
Answered by
mathhelper
Memorize the cosine law according to its pattern
If you want to find angle C, then your equation must
end with CosC on the right, and have c^2 on the left
c^2 = a^2 + b^2 - 2ab cosC
plug in your numbers, leaving you with Cos C as the unknown
use arccos on your calculator to find the angle.
that is, press "2nd cos" for most calculators
Hint: your cosC will be a negative decimal, making angle C obtuse.
Let me know what you get
If you want to find angle C, then your equation must
end with CosC on the right, and have c^2 on the left
c^2 = a^2 + b^2 - 2ab cosC
plug in your numbers, leaving you with Cos C as the unknown
use arccos on your calculator to find the angle.
that is, press "2nd cos" for most calculators
Hint: your cosC will be a negative decimal, making angle C obtuse.
Let me know what you get
Answered by
Fatima Tuz Johora
122
Answered by
Anonymous
57.91
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