Exercice 1 Construire un triangle. ABC 9ont les bissectrices sont trois9roites
concourantes,9onnées9eux. `9eux non perpen9iculaires. Solution 1 Analyse :
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ABC
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BDC5EFG C5H JI5"% K-MLN OP7Q)RPTS/U/V,OPW;X&YZS/U/V,OPW;X&Y ABC [ P7\S2\P7Q d X,OM]^U2\V@S2Y b OUcUO b7b \U/SdOR^aeS/U2\V&QcfV&Q2Q2Y0gS/U/V&g0Y0QZV@PS2_U/V&YRU2Y0Q [ g0\PS2YP(OPS A B YS C h i PjO
(AC) [ SA [ SB
YS
SC
X&Y0QU2_`(Ya^V&\P7Q
SB (SA )(d)) = SB (AB) = (CB) = SC (d).
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(SC ◦ SB ◦ SA )(d) = d.
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