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Tarefa “Como guardar seis bolas de ténis?” (pág. 8 do manual escolar)
2 2 2
2 2 2
2
FG + DG = DF
FG + 6 = 12
FG = 144-36
FG = 108
FG = 6 3
   ,
ˆ ˆˆ ˆ
,
FE GE
=
CF FH
12 6
=
3CF
CF = 6
FGE FHC
pois têm 2 ângulos iguais,
FGE=FHC=90º e GFE=FCH=30º
assim temos que

CI = CF FG GI
CI = 6 6 3 3
CI = 9 6 3
 
 

   
 
 
 
CI CA
=
FG FD
9 6 3 CA
=
126 3
12 9 6 3
CA =
6 3
2 9 6 3
CA =
3
18 12 3 3
CA =
3
CA = 12 + 6 3
Como FGE ∼ FHC , temos




Q2 – Dimensões de cada caixa:
Caixa A – Paralelepípedo, cuja base é de lado 18 cm por 12 cm e altura de 6 cm.
Caixa B – Prismatriangularregular, combase de lado  12+6 3 cme altura de 6 cm.
Caixa C – Cilindrocujabase é umcírculo de raio3 cm e alturade 36 cm.
Q3 – Volume de cada caixa:
  
 
   
3
3 3
2 3 3
18×12×6=1296
12+6 3 9+6 3
×6=
2
= 108+72 3+54 3+36×3 ×3=
= 216+126 3 ×3= 648+378 3 cm 1302,7cm
3 3 1017,9
caixa A
caixa B
caixa C
V
V
V  


  
cm
6 = 324 cm cm
Área total de cada caixa:
     
  
 
   
 
2
2 2
2 2
C
18 12 2 12 6 2 18 6 2 792
12 6 3 9 6 3
2 3 12 6 3 6
2
108 72 3 54 3 36 3 18 12 6 3
216 126 3 216 108 3 432 234 3 837,3
3 2 2 3 36 18 216 234 73
Total caixa A
Total caixa B
Total caixa
A cm
A
cm cm
A cm    
         
 
     
      
     
        2
5,1 cm
Q4 – Volume das seis bolascaixa:
   3 3 34 4
6 3 6 4 9 6 216
3 3
esferasV r cm   
   
         
   
5.1. – Diferença entreo volume da caixa e o volume das seis bolas:
Caixa A:
3
5,6172161296 cm 
Caixa B:
3
1,6242163378648 cm 
Caixa C:
3
324 216 108 339,3cm    
5.2. – Razão entree volume das seis bolas e o volume do caixa:
Caixa A:
524,0
1296
216


Caixa B:
521,0
3378648
216



Caixa C:
67,0
324
216



5.3. – Fração de volumede caixa ocupada por cada bola:
Caixa A:
216
6
1296
 3
cm
Caixa A:
1,217
6
3378648

 3
cm
Caixa A:
6,169
6
324

 3
cm
6. – Qual a embalagemmais eficaz?
Caixa C

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Como guardar bolas de ténis

  • 1. Tarefa “Como guardar seis bolas de ténis?” (pág. 8 do manual escolar) 2 2 2 2 2 2 2 FG + DG = DF FG + 6 = 12 FG = 144-36 FG = 108 FG = 6 3    , ˆ ˆˆ ˆ , FE GE = CF FH 12 6 = 3CF CF = 6 FGE FHC pois têm 2 ângulos iguais, FGE=FHC=90º e GFE=FCH=30º assim temos que 
  • 2. CI = CF FG GI CI = 6 6 3 3 CI = 9 6 3                CI CA = FG FD 9 6 3 CA = 126 3 12 9 6 3 CA = 6 3 2 9 6 3 CA = 3 18 12 3 3 CA = 3 CA = 12 + 6 3 Como FGE ∼ FHC , temos     Q2 – Dimensões de cada caixa: Caixa A – Paralelepípedo, cuja base é de lado 18 cm por 12 cm e altura de 6 cm. Caixa B – Prismatriangularregular, combase de lado  12+6 3 cme altura de 6 cm. Caixa C – Cilindrocujabase é umcírculo de raio3 cm e alturade 36 cm. Q3 – Volume de cada caixa:          3 3 3 2 3 3 18×12×6=1296 12+6 3 9+6 3 ×6= 2 = 108+72 3+54 3+36×3 ×3= = 216+126 3 ×3= 648+378 3 cm 1302,7cm 3 3 1017,9 caixa A caixa B caixa C V V V        cm 6 = 324 cm cm
  • 3. Área total de cada caixa:                  2 2 2 2 2 C 18 12 2 12 6 2 18 6 2 792 12 6 3 9 6 3 2 3 12 6 3 6 2 108 72 3 54 3 36 3 18 12 6 3 216 126 3 216 108 3 432 234 3 837,3 3 2 2 3 36 18 216 234 73 Total caixa A Total caixa B Total caixa A cm A cm cm A cm                                            2 5,1 cm Q4 – Volume das seis bolascaixa:    3 3 34 4 6 3 6 4 9 6 216 3 3 esferasV r cm                      5.1. – Diferença entreo volume da caixa e o volume das seis bolas: Caixa A: 3 5,6172161296 cm  Caixa B: 3 1,6242163378648 cm  Caixa C: 3 324 216 108 339,3cm     5.2. – Razão entree volume das seis bolas e o volume do caixa: Caixa A: 524,0 1296 216   Caixa B: 521,0 3378648 216    Caixa C: 67,0 324 216    5.3. – Fração de volumede caixa ocupada por cada bola: Caixa A: 216 6 1296  3 cm Caixa A: 1,217 6 3378648   3 cm Caixa A: 6,169 6 324   3 cm 6. – Qual a embalagemmais eficaz? Caixa C