Hayleymeyer
  • Hayleymeyer
http://media.education2020.com/evresources/878-12-03-00-00-sur_files/i0070000.jpg
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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Hayleymeyer
  • Hayleymeyer
|dw:1433950053698:dw|
Hayleymeyer
  • Hayleymeyer
each square is 5. find the surface area, ive been doing this for 3 hours, on this type of stuff.
Hayleymeyer
  • Hayleymeyer
@danicap

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geerky42
  • geerky42
OK you gotta have to count squares. But you got to do it in smart way. OK clearly this is 3D. But imagine looking it at certain angle (front, top, and side), so it would looks like 2D Then there will be SAME number of square on opposite sides of whatever you are "looking" at. Get the plan?
Hayleymeyer
  • Hayleymeyer
got it!
geerky42
  • geerky42
For example, if you are looking at top, you will kind of see this: |dw:1433950339164:dw|
geerky42
  • geerky42
then multiply that by 2, for other side (bottom)
Hayleymeyer
  • Hayleymeyer
which would be 16?
geerky42
  • geerky42
Yes there are 16 squares for TOP and BOTTOM. Now count front.
Hayleymeyer
  • Hayleymeyer
16 for the front
geerky42
  • geerky42
you would see this:|dw:1433950434314:dw|
geerky42
  • geerky42
yeah 16. so double that for other sides and you have 32
geerky42
  • geerky42
Ok now side.
Hayleymeyer
  • Hayleymeyer
14?
geerky42
  • geerky42
I got 12
Hayleymeyer
  • Hayleymeyer
my bad! counted 2 extra block
geerky42
  • geerky42
|dw:1433950631697:dw|
geerky42
  • geerky42
OK now double that. 24
geerky42
  • geerky42
Now add them all together: 24 + 32 + 16 = ?
Hayleymeyer
  • Hayleymeyer
72
geerky42
  • geerky42
Yep. So there are 72 squares. Now for each square, what is area?
geerky42
  • geerky42
5 mm * 5 mm = ?
Hayleymeyer
  • Hayleymeyer
10mm^2
geerky42
  • geerky42
No. multiply 5 by 5. What do you get?
geerky42
  • geerky42
A = lw
Hayleymeyer
  • Hayleymeyer
5/5=1
Hayleymeyer
  • Hayleymeyer
im a very slow learner, sorry :(
geerky42
  • geerky42
To get area, you just multiply length by width, right?
Hayleymeyer
  • Hayleymeyer
yes
geerky42
  • geerky42
OK, so length of square is 5 and width is also 5
geerky42
  • geerky42
So you have \(Area = 5\times5\)
Hayleymeyer
  • Hayleymeyer
okay, which would be 25
geerky42
  • geerky42
Yeah Area of EACH square is 25. And there are 72 squares. So multiply 72 by 25. That would be your surface area.
Hayleymeyer
  • Hayleymeyer
which would be 1,875
geerky42
  • geerky42
I got 1800?
geerky42
  • geerky42
\(72\times25\)
Hayleymeyer
  • Hayleymeyer
my bad, I don't no why my calculator is messing up
geerky42
  • geerky42
OK, so you got 1800, right? So your surfacce area is\[SA = \boxed{1800~\text{mm}^2}\]
geerky42
  • geerky42
IS that clear?
geerky42
  • geerky42
Just got to count the smart way, kinda.
Hayleymeyer
  • Hayleymeyer
thanks so much, I appreciate and thanks for your patience!
geerky42
  • geerky42
No problem

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