Perpendicular projection

Determine the distance of a point B[1, -3] from the perpendicular projection of a point A[3, -2] on a straight line 2 x + y + 1 = 0.

Correct result:

d =  0

Solution:

Bx=1;By=3 Ax=3;Ay=2  p:2 x+y+1=0.  qp;Aq  q:x+2y+c=0    Ax+2 Ay+c=0 3+2 (2)+c=0  c=7  q:x+2y+7=0  X=(x,y)=qp  x+2 y+7=0 2 x+y+1=0  x2y=7 2x+y=1  x=1 y=3  d=(Bxx)2+(Byy)2=(11)2+((3)(3))2=0



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For Basic calculations in analytic geometry is helpful line slope calculator. From coordinates of two points in the plane it calculate slope, normal and parametric line equation(s), slope, directional angle, direction vector, the length of segment, intersections the coordinate axes etc.
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