Réponses

2013-03-29T14:36:20+01:00

a. Aire = (BL x h)/2 = (18x3.6)/2 =  32.4 cm²

 

b. Aire = (LE x h')/2 

     LE = 2 x Aire / h' = 2 x 32.4 /3.6 = 18 cm