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Aire d’un triangle

Aire d’un triangle. A l’aide d’un quadrillage. ABCD est un rectangle de 5 cm sur 4 cm. Calculer l’aire du quadrilatère EFGH. E. A. B. F. H. D. C. G. 5  4 =. 20 cm². Aire du rectangle ABCD =. Aire du quadrilatère EFGH = 20 – ( ). 1,5 + 1 + 4,5 + 3. E. A.

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Aire d’un triangle

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  1. Aire d’un triangle A l’aide d’un quadrillage

  2. ABCD est un rectangle de 5 cm sur 4 cm. Calculer l’aire du quadrilatère EFGH. E A B F H D C G

  3. 5  4 = 20 cm² Aire du rectangle ABCD = Aire du quadrilatère EFGH = 20 – ( ) 1,5 + 1 + 4,5 + 3 E A B 1,5 1 F H 10 cm² 20 – 10 3 4,5 D C G

  4. Autre solution… Aire(EHF) = Aire(HFG) = Aire(EFGH) = 2,5 + 7,5 = 10 cm² E A B F H D C G

  5. Ou encore… E A B 1 1,5 F H 3 4,5 D C G

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