Points A(-1,4), B(3,12) and C(7,-2) are given. Find (to the nearest tenth of a degree) the measure of <BAC.
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Originally Posted by help1 Points A(-1,4), B(3,12) and C(7,-2) are given. Find (to the nearest tenth of a degree) the measure of <BAC. You can do this in two ways: Vectors: Find vectors BA and BC. Then Triangles Find sides AB, AC, BC. Then use the Law of cosines: -Dan
Hello, help1! Points are given. Find (to the nearest tenth of a degree) the measure of Are you familiar with this formula? The angle between two lines with slopes . . is given by: . We have: . . . . . and: . Hence: . Therefore: .
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