mary-lloyd_60bf7e8ef3755
mary-lloyd_60bf7e8ef3755
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設向量A與向量B夾角θ 向量內積 AdotB ==> A∙B ==> 純量 A∙B = |A| *|B| *cos θ 平行四邊形的面積 ==> 應該是向量外積 ==> AxB A x B = |A| *|B| *sin θ http://elearning.stut.edu.tw/mechanical/Statics/ne... http://episte.math.ntu.edu…