Question

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

Answer 1

dont you have to do some king of net

Answer 2

*kind

Answer 3

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

Answer 4

i kno but

Answer 5

for the rectangle it gives u only one number

Answer 6

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

Answer 7

whats r? radius?

Answer 8

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

Answer 9

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

Answer 10

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

Answer 11

yup

Answer 12

in a book it said (pi d ) h

Answer 13

hmm ohmygod ur rite

Answer 14

THANKS YOU SO MOAUCH

Answer 15

yeah you know that 2r=d

Answer 16

ye

Answer 17

my pleasure XD

Answer 18

:)

Answer 19

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