Bonjour,
a) aire totale
= aire carré + aire rectangle
= (6m - 3m) x 2m + 3m x 70dm
= 3m x 2m + 3m x 7m
= 6m² + 21m²
= 27m²
b) aire totale
= aire rectangle - aire demi cercle
= 8 x 90cm - (π x (3/2)²)/2
= 8 x 9 - (π x 1,5²)/2
= 72dm² - 7,065dm²/2
= 72dm² - 3,5325dm²
= 68.4675dm²
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Bonjour,
a) aire totale
= aire carré + aire rectangle
= (6m - 3m) x 2m + 3m x 70dm
= 3m x 2m + 3m x 7m
= 6m² + 21m²
= 27m²
b) aire totale
= aire rectangle - aire demi cercle
= 8 x 90cm - (π x (3/2)²)/2
= 8 x 9 - (π x 1,5²)/2
= 72dm² - 7,065dm²/2
= 72dm² - 3,5325dm²
= 68.4675dm²