Hayleymeyer
  • Hayleymeyer
http://media.education2020.com/evresources/878-12-03-00-00-sur_files/i0120000.jpg What is the surface area of the figure above? Note that the figure is made up of congruent cubes. a. 224 cm878-12-03-00-00-sur_files/i0120001.jpg c. 268 cm878-12-03-00-00-sur_files/i0120002.jpg b. 424 cm878-12-03-00-00-sur_files/i0120003.jpg d. 448 cm878-12-03-00-00-sur_files/i0120004.jpg
Mathematics
schrodinger
  • schrodinger
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Hayleymeyer
  • Hayleymeyer
|dw:1433946254697:dw|
Hayleymeyer
  • Hayleymeyer
sorry, my drawing isn't good!
anonymous
  • anonymous
I finished my summer school :D

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Hayleymeyer
  • Hayleymeyer
Hayleymeyer
  • Hayleymeyer
>:(
anonymous
  • anonymous
I'm on my phone right now
Hayleymeyer
  • Hayleymeyer
No one will help me lol
Hayleymeyer
  • Hayleymeyer
Hayleymeyer
  • Hayleymeyer
Hayleymeyer
  • Hayleymeyer
Hayleymeyer
  • Hayleymeyer
@triciaal please help!
anonymous
  • anonymous
lol, looks like you are having a hard time.
Hayleymeyer
  • Hayleymeyer
I am! please help?
anonymous
  • anonymous
look at the answer choices.
Hayleymeyer
  • Hayleymeyer
ok.
anonymous
  • anonymous
there is nothing there, there are no real answer choices. so i cant give u an accurate answer.
Hayleymeyer
  • Hayleymeyer
A=224cm2 b=424mm2 c=268mm2 d=448mm2
Hayleymeyer
  • Hayleymeyer
geerky42
  • geerky42
Can't tell for sure. We don't know the size of single cube.
Hayleymeyer
  • Hayleymeyer
it says there each 4?
geerky42
  • geerky42
OK. You know formula for surface area of rectangle prism? \(SA = 2lw+2wh+2lh\) Can you tell me what is length? Width? and height?
Hayleymeyer
  • Hayleymeyer
L=4 W=1 H=2
geerky42
  • geerky42
Yeah and each cube is 4 unit^3 So you have L = 4*4 W = 1*4 H = 2*4 Right?
Hayleymeyer
  • Hayleymeyer
yes
geerky42
  • geerky42
Ok so L = 16 W = 4 H = 8 Now plug in and solve: \[SA = 2LW+2WH+2LH\]
Hayleymeyer
  • Hayleymeyer
576 :)
geerky42
  • geerky42
\[SA = 2(16)(4) + 2(4)(8) + 2(16)(8)\]
geerky42
  • geerky42
I didn't get 576.
Hayleymeyer
  • Hayleymeyer
448*
geerky42
  • geerky42
OK there you go
Hayleymeyer
  • Hayleymeyer
thank you for your time! I appreciate it!
geerky42
  • geerky42
No problem

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