In advanced mathematics (pitkä matematiikka), what is the area of the triangle in with vertices , , and ?

Answer and explanation

Correct answer: B.

  1. Step 1: Vectors are and . The cross product is . The magnitude is . The triangle area is half of this: . Wait, let's check: , so area is . Let's make the correct answer! **Answer: . Why not the others:** is the area of the parallelogram without halving, and is an incorrect calculation.

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