Sirlw
how do you find the surface area of a cylinder?
Ex:
r=4
width(across)=21



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Sirlw
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dont you have to do some king of net

Sirlw
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*kind

hoblos
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area = 2pi*r^2 + 2pi*r*h

Sirlw
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i kno but

Sirlw
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for the rectangle it gives u only one number

Sirlw
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wait for the rectangle its pi*r=?*h=hight

Sirlw
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whats r? radius?

Sirlw
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but i thought for rectangle it was like height times width or the other side

hoblos
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the area of the rectangle here = perimeter of the circle multiplied by the height
since the perimeter actually its width

Sirlw
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so the area of rectangle is the circumference of circle times the hieght?

hoblos
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yup

Sirlw
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in a book it said (pi d ) h

Sirlw
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hmm ohmygod ur rite

Sirlw
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THANKS YOU SO MOAUCH

hoblos
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yeah you know that 2r=d

Sirlw
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ye

hoblos
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my pleasure XD

Sirlw
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:)

sfozturk61
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2(pi)rh+2(pi)r^2 is its surface