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Mathematics 21 Online
OpenStudy (anonymous):

who is good with surface are of prisms and cylinders?

OpenStudy (shane_b):

What's the question?

OpenStudy (anonymous):

ill try my best to draw it since its a cylinder.

OpenStudy (shane_b):

Do you have the dimensions? No need to draw it unless it's some odd looking cylinder

OpenStudy (anonymous):

height is 1 and i think it may be the base or radius is also 1.

OpenStudy (anonymous):

A.3.14 B.6.28 C.9.42 D.none of the above are my choices for answers

OpenStudy (shane_b):

If it's just a normal cylinder the formula is just the circumference times the height:\[Surface~Area=2 \pi rh\]

OpenStudy (shane_b):

So based on the formula, the answer is ?

OpenStudy (anonymous):

none of the above?

OpenStudy (shane_b):

if r and h = 1, the answer must be 2 pi :)

OpenStudy (shane_b):

which is B

OpenStudy (anonymous):

ohhh okay thank you

OpenStudy (anonymous):

omg can you help me with my next question

OpenStudy (shane_b):

ok

OpenStudy (anonymous):

|dw:1340761711214:dw|

OpenStudy (anonymous):

it says the area is 15.6cm squared.what is the surface area

OpenStudy (shane_b):

This one should be pretty straightforward if you look at the image. Do you know how to get the area of a triangle and rectangle?

OpenStudy (anonymous):

i dont remember

OpenStudy (shane_b):

\[A_{triangle}=\frac{1}{2}bh\]\[A_{rect}=L*W\]

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