Bonjour
a)
ABD + DBC:
(12*6)/2 + ( (12*6)/2= 36+36 => 72cm²
b)
GD triangle+ petit triangle :
(6 *6)/2 + (6*2,5)/2 =
18 + 7,5 => 25,5cm²
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Bonjour
a)
ABD + DBC:
(12*6)/2 + ( (12*6)/2= 36+36 => 72cm²
b)
GD triangle+ petit triangle :
(6 *6)/2 + (6*2,5)/2 =
18 + 7,5 => 25,5cm²