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Sagot :

Réponse:

Aire ABCD= Aire ABC+ Aire ACD

A

[tex] = 3c \times 4c \div 2 + 12c \times 5c \div 2[/tex]

[tex] = 12 {c}^{2} \div 2 + 60 {c}^{2} \div 2[/tex]

[tex] = 6 {c}^{2} + 30 {c}^{2} = 36 {c}^{2} [/tex]

Aire de EFGH

=6c×10c=60c^2

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