115 Isocèle Raisonner
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ABC est un triangle isocèle en A tel que AB =
BC.
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1. Dans cette question, on prend BC = 6 cm.
a. Calculer la longueur AB.
b. Construire le triangle ABC.
2. On nomme x la longueur du segment BC. Exprimer
en fonction de x le périmètre du triangle ABC.

Given: lines a and b are parallel and line c is a transversal. prove: 2 is supplementary to 8 what is the missing reason in the proof? statement reason 1. a || b, is a transv 1. given 2. ∠6 ≅ ∠2 2. ? 3. m∠6 = m∠2 3. def. of congruent 4. ∠6 is supp. to ∠8 4. def. of linear pair 5. ∠2 is supp. to ∠8 5. congruent supplements theorem corresponding angles theorem alternate interior angles theorem vertical angles theorem alternate exterior angles theorem