Question

What is the surface area of this prism?



A.
6480 m2

B.
3312 m2

C.
3240 m2

D.
1656 m2

Answer 1

http://static.k12.com/calms_media/media/395500_396000/395737/3/1dcaacc5cccf19011d077d3f13398b933329de72/53273_question.jpg

Answer 2

Just a sec

Answer 3

ok

Answer 4

Ok, we need to do the same thing here, find the area of each individual shape, then add them up

Answer 5

ok

Answer 6

For a triangle, you will use the formula \(\dfrac{h*b}{2}\) then multiply that by 2 since there are 2 triangles. The height for these triangles is 12 and the base is 18.

Answer 7

so 12 x 18 x 2?

Answer 8

divided by 2

Answer 9

Actually, just 12*18 since you are dividing by 2 then multiplying by 2.

Answer 10

It will give you the same result either way

Answer 11

ok

Answer 12

i got 216!

Answer 13

Ok, now you need to find the areas of the rectangles.

Answer 14

That would be 30*18 and (30*15)*2

Answer 15

ok

Answer 16

i got 1980!

Answer 17

Can you show me what you did so I can see what you did wrong?

Answer 18

wait was i supposed to add them together...

Answer 19

or leave them as individual answers...

Answer 20

Yes, add them all together

Answer 21

including the 216

Answer 22

yep

Answer 23

then i got 2196!

Answer 24

Can you show me what you multiplied?

Answer 25

was i wrong again... :/

Answer 26

I may have miscalculated something, I just want to see where one of us went wrong.

Answer 27

ok i multiplied 30*18 and 30*15*2 then i added the answers up with 216

Answer 28

What did you get for 30*18?

Answer 29

540

Answer 30

Here is what I am showing
\(30*18=540\\30*15=450*2=900\\540+900+216\)

Answer 31

1656

Answer 32

Yep

Answer 33

Thx

Answer 34

can you help me with like 3 more plz

Answer 35

Yes

Answer 36

ok thx