Bonsoir,
1° formule:
addition des 4 rectangles
xy + 18x + 18*12 +12y
= ( xy + 18x + 12y +216) cm²
2° formule
L*l
(y+18)( x+12)
= xy +12y + 18x +18*12
= (xy +18x +12y + 216)cm²
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Bonsoir,
1° formule:
addition des 4 rectangles
xy + 18x + 18*12 +12y
= ( xy + 18x + 12y +216) cm²
2° formule
L*l
(y+18)( x+12)
= xy +12y + 18x +18*12
= (xy +18x +12y + 216)cm²