Missing

\title{Propriété de Thalès dans un triangle (I)}
\language{fr}
\range{-5..5}
\author{Odile Bénassy}
\email{obenassy@free.fr}
\computeanswer{no}
\format{html}
\precision{1000}

\matrix{donnee=
10,12
12,14
14,16
16,20
20,24}
\real{coef=random(0.8,0.75,0.5,0.4,0.25,0.2)}
\text{ligne=randomrow(\donnee)}
\integer{AB=item(1,\ligne)}
\real{AM=\AB*\coef}
\integer{BC=item(2,\ligne)}
\real{MN=\BC*\coef}

\real{xM= (-5) - (10*\coef)}
\real{yM= (2.2*\xM) + 23}
\real{xN= (-5) + (21*\coef)}
\real{yN= (142/21) - ((22*\xN)/21)}


\statement{<p><center>

\if{debug iswordof \oefenv}{<p>\xM,\yM,\xN,\yN}

\draw{200,200}{
xrange -20,20
yrange -20,20
triangle -5,12,-15,-10,16,-10,black
line -15,-10,16,-10,red
line \xM,\yM,\xN,\yN,red
text black,-5.5,14.5,medium,A
text black,-17,-10,medium,B
text black,17,-10,medium,C
text black,\xM - 2,\yM + 2,medium,M
text black,\xN + 1,\yN + 2,medium,N
}
</center> <p>
[MN] // [BC] ; AB = \AB cm ; AM = \AM cm ; BC = \BC cm. Combien mesure MN (en cm) ?}


\answer{Longueur de [MN]}{\MN}{type=default}