Bonjour,
EA = BA - BE = 6 - 4 = 2 cm
DF = BF - BD = 7 - 4 = 3 cm
aire BDCE = aire BACF - aire EAC - aire DFC
= 6 × 7 - 2 × 7 ÷ 2 - 3 × 6 ÷ 2
= 26 cm²
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Bonjour,
EA = BA - BE = 6 - 4 = 2 cm
DF = BF - BD = 7 - 4 = 3 cm
aire BDCE = aire BACF - aire EAC - aire DFC
= 6 × 7 - 2 × 7 ÷ 2 - 3 × 6 ÷ 2
= 26 cm²