Mathematics
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OpenStudy (gabbyalicorn):
What is the surface area of the prism?
A.
82 yd2
B.
90 yd2
C.
96 yd2
D.
108 yd2
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OpenStudy (michele_laino):
here we have two rectangle triangles like this:
|dw:1433626232605:dw|
the area of each of such triangle is:
A=(3*4)/2=...
OpenStudy (gabbyalicorn):
i got 6 then since u said there was two then 6 x 6 ? or 6 plus 6
OpenStudy (michele_laino):
we have 2 of such triangles, so the corresponding area is:6+6=...
OpenStudy (gabbyalicorn):
9
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OpenStudy (michele_laino):
6+6=12
OpenStudy (michele_laino):
am I right?
OpenStudy (gabbyalicorn):
oh crap im sorry your right lol i dont know what i was thinking XP
OpenStudy (michele_laino):
now, we have one rectangle like this:
|dw:1433626488374:dw|
which is the base of your prism. The area of that rectangle is:
3*7=...
OpenStudy (gabbyalicorn):
21
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OpenStudy (michele_laino):
ok!
OpenStudy (michele_laino):
now, we have another ectangle like this:
|dw:1433626580385:dw|
and its area is:
5*7=...
OpenStudy (gabbyalicorn):
35
OpenStudy (michele_laino):
ok!
OpenStudy (michele_laino):
finally, we have this rectangle:
|dw:1433626641337:dw|
and its area is:
4*7=...
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OpenStudy (gabbyalicorn):
28
OpenStudy (michele_laino):
correct!
So the total area is:
6+6+21+35+28=...
OpenStudy (gabbyalicorn):
96
OpenStudy (michele_laino):
that's right!
area = 96 yd^2
OpenStudy (gabbyalicorn):
:D yay! TY!
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OpenStudy (michele_laino):
:)