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baoleeee
4 tháng trước

Cho A(0;-1) và B(-4;3) viết phương trình đường thẳng (d) là trung trực của AB.Tính góc tạo bởi (d) với Ox Giúp mình với mọi người ơi chưa làm dạng này bao giờ @@

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Lê Minh
4 tháng trước

Đáp án:

$A(0;-1) ; B(-4;3)$
$=>vtAB(-4;4)$

gọi $I(xI;yI) $là trung điểm AB 

$=>xI=0-4/2=-2$

 $yI=-1+3/2=1$

$=>VTPT$của d$ (-4;4)$

$=> PT (d)-4x+4y-12=0$

$=>y-x-3=0$

Pt Ox :$y=0$

$=> cos (d;Ox)=\frac{l0+1l}{1√2}=1/√2$

=>gói tạo bởi d và Ox $=45$

Giải thích các bước giải:

 

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