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Can anyone tell me do I use minus or plus here? I know what to do to get the equation if it's "fine angle" or "Obtuse angle" But don't know what to do when it's an Isosceles of a right angle.
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I’m a little confused on what it is you’re doing. Is this 3-dimensional space? You drew lines but in 3D space the linear combination Ax + By + C represents a plane. If it’s 2D space, what are the lines equal to? 0? If they are lines in 2D space and they’re orthogonal then a1a2 + b1b2 = 0.
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Please forgive my English. In the post the word "isosceles" is actually "angle bisector line"
I used Google translate to translate the word, it kinda did it wrong.

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