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Antonia77
@Antonia77
May 2019
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Bonjour, pouvez-vous m'aidez pour l'exercice 4 s'il vous plaît.
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Bonjour,
Par exemple :
aire RSTUV = aire RSIV - aire TIU
TI = SI - ST = 9 - 7 = 2
UI = VI - VU = 15 - 9 = 6
donc : aire RSTUV = aire RSIV - aire TIU
= (15×9) - (6×2)÷2
= 135 - 6
= 129 (cm²)
aire LMNOP = aire LQP - aire NMQO
LQ = 57 mm + 1,2 cm = 5,7 cm + 1,2 cm = 6,9 cm
PQ = 18 mm + 1 cm = 1,8 cm + 1 cm = 2,8 cm
donc : aire LMNOP = aire LQP - aire NMQO
= (6,9×2,8)÷2 - (1,2×1)
= 9,66 - 1,2
= 8,46 (cm²)
aire ABCD = aire ABC + aire ACD
= (3×4)÷2 + (5×12)÷2
= 6 + 30
= 36 (cm²)
Je te laisse faire le dernier.
La figure comporte un carré, un triangle rectangle et un trapèze
(tu dois arriver à : 37,125 cm²)
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Verified answer
Bonjour,Par exemple :
aire RSTUV = aire RSIV - aire TIU
TI = SI - ST = 9 - 7 = 2
UI = VI - VU = 15 - 9 = 6
donc : aire RSTUV = aire RSIV - aire TIU
= (15×9) - (6×2)÷2
= 135 - 6
= 129 (cm²)
aire LMNOP = aire LQP - aire NMQO
LQ = 57 mm + 1,2 cm = 5,7 cm + 1,2 cm = 6,9 cm
PQ = 18 mm + 1 cm = 1,8 cm + 1 cm = 2,8 cm
donc : aire LMNOP = aire LQP - aire NMQO
= (6,9×2,8)÷2 - (1,2×1)
= 9,66 - 1,2
= 8,46 (cm²)
aire ABCD = aire ABC + aire ACD
= (3×4)÷2 + (5×12)÷2
= 6 + 30
= 36 (cm²)
Je te laisse faire le dernier.
La figure comporte un carré, un triangle rectangle et un trapèze
(tu dois arriver à : 37,125 cm²)