bonjour
on applique le th de Pythagore
10 ² = 3 ² + 1 ²
100 = 9 + 1
100 ≠ 10
donc ABC n'est pas rectangle
MH² = 7.8² - 3 ²
MH² = 60.84 - 9 = 51.84
MH = √ 51.84 = 7.2 m
HT² = 7.5² - 7.2 ²
HT² = 56.25 - 51.84 = 4.41
HT = √ 4.41 = 2.1 cm
7.8 + 7.5 + 5.1 = 20.4 cm
donc Eva a tort
