use the law of cosines to find two of the angles.
Then you can get the third, and the answer.
As for the area, it is a*b*sinC where a,b,c are the sides, and A,B,C are the angles (unrelated to the given points)
a triangle has vertices A(2,3,7), B(0,-3,4) and C(5,2,-4).
a. determine the largest angle in the triangle
b. determine the area of triangle ABC
1 answer