newcircleA = :=3D circleA cutbefore P1 cutafter P2 .. reverse(circleB cutbefore P1 = cutafter P2) .. cycle;

I = need 10 points to define the shape, but as my connections are = duplicated, I have 12 points.

The solution (I thought) would be to = use the =C2=AB & =C2=BB operator = :

newcircleA :=3D circleA cutbefore P1 cutafter = P2 & reverse(circleB cutbefore P1 cutafter P2) & cycle = ;

But = this does not work (same reason as before: "! Paths don't touch; `&' = will be changed to `..'.").

The compete minimal code (if somebody wants to = plus with it) is here :

% = =E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2= =80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80= =94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94

<= div>\startMPpage

path circleA , circleB ;

pair = P[];

defaultscale :=3D 0.4 ;

circleA :=3D fullcircle scaled 1in randomized 3 = ;

circleB :=3D fullcircle scaled 1in randomized 3 = shifted(0.3in,0.3in) ;

draw circleA = withcolor blue ;

draw circleB withcolor red ;

P[1] :=3D circleA intersectionpoint circleB = ;

dotlabel.lft("$P_1$",P[1]) = ;

dotlabel.rt("$\blue\tfx P_0^A$",point 0 of circleA) = ;

P[2] :=3D reverse(circleA) intersectionpoint circleB = ;

dotlabel.rt("$P_2$",P[2]) ;

dotlabel.rt("$\red\tfx = P_0^B$",point 0 of circleB) ;

path = newcircleA , newcircleB ;

% newcircleA :=3D (circleA cutbefore = P1 cutafter P2 ) & (P2 -- P1) & cycle ;

% = previous line gives an error :

% "! Paths don't touch; `&' = will be changed to `..'."

newcircleA :=3D circleA cutbefore P1 = cutafter P2 -- (P2 -- P1) -- cycle ;

newcircleA :=3D = newcircleA xshifted 2in ;

draw newcircleA withcolor = darkgreen ;

newcircleB :=3D (circleB = cutafter P1) -- (P1 -- P2) -- (circleB cutbefore P2 ) & cycle = ;

newcircleB :=3D newcircleB xshifted 2in = ;

draw newcircleB withcolor black ;

drawpoints = newcircleA ; drawpointlabels newcircleA ;

% Mikael solution

newcircleA :=3D = circleA cutbefore P1 cutafter P2 -- cycle ;

newcircleA :=3D = newcircleA yshifted -1.5in ;

draw newcircleA withcolor = darkgreen ;

drawpoints newcircleA ; drawpointlabels newcircleA = ;

% partial = moon

newcircleA :=3D circleA cutbefore P1 cutafter = P2

.. reverse(circleB cutbefore P1 = cutafter P2) .. cycle;

% & (reverse(circleB) cutbefore = P2 cutafter P1) & cycle;

newcircleA :=3D newcircleA = shifted(2in,-1.5in) ;

draw newcircleA withcolor magenta = ;

drawpoints newcircleA ; drawpointlabels newcircleA = ;

\stopMPpage

Thanks for any help = !

Fabrice.