Mathematics
Senior High
2番を教えて欲しいです。
(1)
10 次の3点を頂点とする三角形の面積Sを求めよ。
A(-2, 1, 3), B(-3, 1, 4), C(-3, 3, 5)
A(2, -1, 2), B(-1, 1, 2), C(2, 1, 1)
(2)
AB (-3-1-2), 1-1₁ 4-3) = (-1,0
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