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MAT 2140 - Quiz 1 - Fall 2021 You must show ALL of your steps and all of your work. Box your answers. *Insufficient work shown will lose points (even if your answer is correct). For questions 1 through 3, consider the triangle with vertices A(-1, 4, 2), B(3, 0, 5), and C(2, -2, 1). 1. Express the vector AC as a product of its magnitude and direction. 2. Find the perimeter of the triangle (give exact answer).3. Find the interior angle of the triangle at point B (give answer in degrees to 4 decimal places)