Asked by Maria
Find the interior angles of the triangle with vertices (-4,1), (1,-6), and (5,-1)
Answers
Answered by
Steve
If we label the points A,B,C, then
AB=√84
BC=√41
AC=√85
85 = 84+41-2√84√41 cosB
Now you can use law of sine or cosine for one other angle, and then the angles sum to 180.
AB=√84
BC=√41
AC=√85
85 = 84+41-2√84√41 cosB
Now you can use law of sine or cosine for one other angle, and then the angles sum to 180.
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