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HELP

H = 8
A1x=1; A1y=2; B1x=3; B1y=8
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L = Math.sqrt((A1x-B1x)*(A1x-B1x)+(A1y-B1y)*(A1y-B1y))     // AB
m1= -(B1x-A1x)/(B1y-A1y)                                   // slope of the perpendicular to AB
Mx = A1x+(B1x-A1x)/2; My = A1y+(B1y-A1y)/2                 // center of AB
BA=H/Math.sqrt(1+m1*m1); HE= BA*m1                         // DeltaX, DeltaY of the altitude of the triangle
D1x = Mx + BA; D1y = My + HE                               // second end of altitude
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function f(x) { y = 1/0; return y }
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aX = -1; bX = 10; aY = -1; bY = 10
Dx = 1; Dy = 1
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Px=[A1x,B1x]; Py=[A1y,B1y]; Qx=[Mx]; Qy=[My]
Lx=[Mx,D1x]; Ly=[My,D1y]
L1x=[A1x,B1x,D1x,A1x]; L1y=[A1y,B1y,D1y,A1y]
C0="red"
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AX=BX=AY=BY=""
BY="A=("+A1x+","+A1y+")  B=("+B1x+","+B1y+")  H="+H
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AAX=aX; BBX=bX; AAY=aY; BBY=bY
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