Explications étape par étape:
Aire ( ABCD) = 4×4 = 16 cm2
Aire (AEFG) = ( 4 + x ) × ( 2 + 4)
= ( 4 + x) × 6
= 4 × 6 + x × 6
= 6x + 24
Si x = 4
( 4 + 4) × ( 2+4)
= 8 × 6
= 48cm2
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Explications étape par étape:
Aire ( ABCD) = 4×4 = 16 cm2
Aire (AEFG) = ( 4 + x ) × ( 2 + 4)
= ( 4 + x) × 6
= 4 × 6 + x × 6
= 6x + 24
Si x = 4
( 4 + 4) × ( 2+4)
= 8 × 6
= 48cm2