Asked by Trish Una
Given with b = 5, c = 32, and m(angle)A=40° , find a. Round the cosine value to the nearest thousandth and answer to the nearest hundredth
Answers
Answered by
oobleck
use the law of cosines:
a^2 = b^2 + c^2 - 2bc cosA
a^2 = b^2 + c^2 - 2bc cosA
Answered by
Trish Una
I got
20.33 is it okay?
20.33 is it okay?
Answered by
oobleck
Nope. You should check to see whether an answer you get makes sense.
Try to draw a triangle with a base of 32, with the other sides 5 and 20.33
It can't be done. Even stretching the other two sides out flat, they are not long enough to form a triangle. You know that you need c < a+b
Too bad you didn't show how you got that value. Try again.
Try to draw a triangle with a base of 32, with the other sides 5 and 20.33
It can't be done. Even stretching the other two sides out flat, they are not long enough to form a triangle. You know that you need c < a+b
Too bad you didn't show how you got that value. Try again.
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