Réponse :
Aire de AEBDF = Aire du triangle BED + Aire du triangle AEF
= (ED x BC ÷ 2) + ( EF x AC ÷ 2)
= (6 x 5 ÷ 2) + (9 x 3 ÷ 2)
= 15 + 13,5
= 28,5 cm ²
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Réponse :
Aire de AEBDF = Aire du triangle BED + Aire du triangle AEF
= (ED x BC ÷ 2) + ( EF x AC ÷ 2)
= (6 x 5 ÷ 2) + (9 x 3 ÷ 2)
= 15 + 13,5
= 28,5 cm ²