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mymoolydolasau
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Cho A(-1,2), B(3,-2) C(0,5) a.Tính (AB) ⃗ , (BC) ⃗ . b. Tính chi vi tam giác ABC. c. Viết phương trình tổng quát đường cao AH của tam giác ABC. d. Viết phương trình tổng quát đường trung trực của BC. e. Tính khoảng cách từ A đến đường thẳng Δ : 3x-4y+1=0 ● Chú ý : Công thức tính khoảng cách từ M(x_0,y_0) đến ∆: a_x+b_y+c=0 là d (M;∆) = |a_(x_0 )+b_(y_0 )+c|/√(a^2+b^2 )
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