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2014-10-09T09:17:06+02:00
Bonjour

TE = BR - VT = 13 - 9.6 = 3.4 cm

BT² = 7,2² + 9,6² = 144
BT = √144 = 12 cm

TB/TN = TV/TE = BV/NE

12/TN = 9.6/3.4
9,6 TN =12 x 3.4

9,6 Tn = 40,8
TN = 4,25 cm