Réponses

2013-03-14T11:25:22+01:00

UR² = 27² + 125² = 16354

BE = V(125²+75²) = 25V(25+9)  = 25V34

Thalès: IR/BE = 48/75 => IR = 25V34.16/25 =

             LI/LB = 48/75 => LI = 125.48/75 = 80

BI = 125 - 80 = 45

UI² = 45² + 75²

IR² + UI² = 256.34 + 45² + 75² = 16354 = UR²

donc le triangle est rectangle