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

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dont you have to do some king of net
area = 2pi*r^2 + 2pi*r*h

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Other answers:

i kno but
for the rectangle it gives u only one number
wait for the rectangle its pi*r=?*h=hight
whats r? radius?
but i thought for rectangle it was like height times width or the other side
the area of the rectangle here = perimeter of the circle multiplied by the height since the perimeter actually its width
so the area of rectangle is the circumference of circle times the hieght?
in a book it said (pi d ) h
hmm ohmygod ur rite
yeah you know that 2r=d
my pleasure XD
2(pi)rh+2(pi)r^2 is its surface

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