[請益] 一題向量的問題
我表妹寒假問我的 數學太久沒用忘掉了 xd
向量AB = (6,1) 向量CD = (-2,-3) 向量BC // 向量AD
向量AC 垂直 向量BD 則四邊形ABCD面積為??
Ans 15
好久沒算了 有好心的大大幫忙一下嗎 謝謝
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