Find the equation of the line through [1,2,-1] perpendicular to the plane ,the length of the perpendicular, and the coordinates of its foot
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The parametric equations of the line l with parameter t is
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The projection of on the plane is
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The length of the perpendicular is
Let the straight line pass through the point and has direction-cosines (or ratios)
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Define the line l1 that passes through and has as its direction-ratios
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Define the line l which is the intersection of two given planes p1, p2
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