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Honorinlauriane
@Honorinlauriane
May 2019
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Bjr pouvez vous m aider svp c est pour demain
urgent!!
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Salut !
aire d'un disque = π × r²
a) on a un demi-disque de rayon 2,5 cm
donc, aire = (π × 2,5²) × 1/2 = 6,25π ÷ 2 = 3,125π ≈ 9,82 cm²
b) on a 1/4 de disque de rayon 4 cm
donc, aire = (π × 4²) × 1/4 = 16π ÷ 4 = 4π ≈ 12,57 cm²
c) on a 3/4 d'un disque de rayon 6 cm
donc aire = (π × 6²) × 3/4 = 36π × 3/4 = 27π ≈ 84,82 cm²
d) 120° = 360° ÷ 3
on a donc 1/3 de disque de rayon 3 cm
je te laisse finir.......
2 votes
Thanks 2
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Lista de comentários
aire d'un disque = π × r²
a) on a un demi-disque de rayon 2,5 cm
donc, aire = (π × 2,5²) × 1/2 = 6,25π ÷ 2 = 3,125π ≈ 9,82 cm²
b) on a 1/4 de disque de rayon 4 cm
donc, aire = (π × 4²) × 1/4 = 16π ÷ 4 = 4π ≈ 12,57 cm²
c) on a 3/4 d'un disque de rayon 6 cm
donc aire = (π × 6²) × 3/4 = 36π × 3/4 = 27π ≈ 84,82 cm²
d) 120° = 360° ÷ 3
on a donc 1/3 de disque de rayon 3 cm
je te laisse finir.......