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Mathematics 19 Online
OpenStudy (gabbyalicorn):

What is the surface area of the prism? A. 82 yd2 B. 90 yd2 C. 96 yd2 D. 108 yd2

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

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

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=...

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!

OpenStudy (michele_laino):

:)

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