gabbyalicorn
  • gabbyalicorn
What is the surface area of the prism? Solid Figures, Part 1 A. 480 in2 B. 348 in2 C. 116 in2 D. 672 in2
Mathematics
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gabbyalicorn
  • gabbyalicorn
What is the surface area of the prism? Solid Figures, Part 1 A. 480 in2 B. 348 in2 C. 116 in2 D. 672 in2
Mathematics
jamiebookeater
  • jamiebookeater
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gabbyalicorn
  • gabbyalicorn
https://www.dropbox.com/s/wu96haczotom8he/Screenshot%202015-06-15%2020.07.15.png?dl=0
jim_thompson5910
  • jim_thompson5910
|dw:1434424134494:dw|
jim_thompson5910
  • jim_thompson5910
|dw:1434424434549:dw|

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jim_thompson5910
  • jim_thompson5910
what is the area of the front triangular face? |dw:1434424485040:dw|
gabbyalicorn
  • gabbyalicorn
16?
jim_thompson5910
  • jim_thompson5910
no
jim_thompson5910
  • jim_thompson5910
|dw:1434424530558:dw|
jim_thompson5910
  • jim_thompson5910
area of triangle = (base*height)/2
gabbyalicorn
  • gabbyalicorn
Oh, sorry. My mistake. 96
jim_thompson5910
  • jim_thompson5910
closer
jim_thompson5910
  • jim_thompson5910
but still no
jim_thompson5910
  • jim_thompson5910
area of triangle = (base*height)/2
gabbyalicorn
  • gabbyalicorn
Oh, divide. 48
jim_thompson5910
  • jim_thompson5910
yep that's the front face
jim_thompson5910
  • jim_thompson5910
front face = 48 back face = 48 since the two faces are congruent
gabbyalicorn
  • gabbyalicorn
Right, makes sense..
jim_thompson5910
  • jim_thompson5910
|dw:1434424668167:dw|
Kash_TheSmartGuy
  • Kash_TheSmartGuy
S=Ph+2B S=36(7)+2(0.5)(16)(6) S=252+96 Surface Area= 348in2 B.
gabbyalicorn
  • gabbyalicorn
7 x 16?
jim_thompson5910
  • jim_thompson5910
|dw:1434424731265:dw|
gabbyalicorn
  • gabbyalicorn
70
Kash_TheSmartGuy
  • Kash_TheSmartGuy
It's B. Confirm it.
jim_thompson5910
  • jim_thompson5910
the face face will be the same since it's also a 7 by 10 rect |dw:1434424787273:dw|
jim_thompson5910
  • jim_thompson5910
oops meant to write "left face"
jim_thompson5910
  • jim_thompson5910
not face face
gabbyalicorn
  • gabbyalicorn
k so 48, 48, 70 and 70.
jim_thompson5910
  • jim_thompson5910
front face = 48 back face = 48 right face = 70 left face = 70
gabbyalicorn
  • gabbyalicorn
I got 236.
jim_thompson5910
  • jim_thompson5910
now you need the bottom face |dw:1434424863320:dw|
gabbyalicorn
  • gabbyalicorn
This one is hard, I'm thinking 16 x 7?
jim_thompson5910
  • jim_thompson5910
yep |dw:1434424946890:dw|
gabbyalicorn
  • gabbyalicorn
Hazaa! 112
jim_thompson5910
  • jim_thompson5910
front face = 48 back face = 48 right face = 70 left face = 70 bottom face = 112
gabbyalicorn
  • gabbyalicorn
so add 48, 48, 70, 112, and 70.
jim_thompson5910
  • jim_thompson5910
yep
gabbyalicorn
  • gabbyalicorn
Which is B, 348. Thank you! ^u^
jim_thompson5910
  • jim_thompson5910
no problem

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