bonsoir
AB² = 104 ² - 96 ² = 1 600
AB = √1600 = 40 mm
Aire = ( 40 x 96 ) /2 = 1 920 mm²
Aire = ( 104 x BH) / 2
104 BH/2 = 1 920
52 BH = 1 920
BH = 1920/52 ≈ 36.92 mm