[//command
viewDir(35,65), view(-6,5,-5,4), size(7), V:=Origin, h:=2.5, L:=8, l:=5, T:=M(0,0,h), U:=M(0,l,0), R:=M(0,l,h),
N:=M(L,l,0), M:=M(L,0,0), Width:=8, Color:=magenta, LineStyle:=userdash, Ligne3D([M,U],0),
Color:=black, Ligne3D([M,V,U,jump,V,T],0),
LineStyle:=solid, Ligne3D([N,U,R,N,M,T,R],0),
Color:=magenta, Ligne3D([M,R],0),
FillStyle:=full, FillOpacity:=0.6, FillColor:=green, LineStyle:=noline,
wedge(Proj3D(R),Proj3D(M),Proj3D(U),2), wedge(Proj3D(R),Proj3D(N),Proj3D(U),2),
Color:=black, FillStyle:=none,
LabelArc(Proj3D(R),Proj3D(M),Proj3D(U),1.2,-1,"$\alpha$"),
LabelArc(Proj3D(R),Proj3D(N),Proj3D(U),1.2,-1,"$24\no$"),
LineStyle:=solid, Color:=darkgreen, FillStyle:=full,
angleD(Proj3D(M),Proj3D(T),Proj3D(R),0.25),
angleD(Proj3D(M),Proj3D(V),Proj3D(T),0.25),
angleD(Proj3D(N),Proj3D(U),Proj3D(R),0.25),
Color:=black,
L:=[M,"$M$","O", T,"$T$","N", R,"$R$","N", U,"$U$","E",
N,"$N$","S", V,"$V$","NE"],
for Z in L by 4 do
LabelDot3D(Z[1,2], Z[3], Z[4])
od
]
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