anonymous
  • anonymous
find the surface area of the space figure. 28 ft by 36 ft.
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
its a cylinder if that helps
anonymous
  • anonymous
plz help!
anonymous
  • anonymous
Surface Area = Areas of top and bottom +Area of the side Surface Area = 2(Area of top) + (perimeter of top)* height Surface Area = 2(pi r 2) + (2 pi r)* h

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anonymous
  • anonymous
a cylinder is made up of 3 parts: 2 circles are each end, and a rectangle wrapped around the circles for the main part
anonymous
  • anonymous
it is a 3dimenton figer
anonymous
  • anonymous
Surface Area of a Cylinder = 2 pi r 2 + 2 pi r h
anonymous
  • anonymous
ok, but why is that the case? because there are 2 circles (for the 2 * pi*r^2), then a rectangle which constitutes the middle, the rectangle has height=h, and the width of the rectangle equals the circumference of the circle, which is 2*pi*r
anonymous
  • anonymous
so the area of the two circles is: 2* (pi*r^2) area of the rectangle is: h * width, where width = 2*pi*r, so -> h*(2*pi*r)
anonymous
  • anonymous
(h is the height of the cylinder, r is the radius of the top)
anonymous
  • anonymous
so as glenn pointed out: Surface Area of a Cylinder = 2 pi r 2 + 2 pi r h
anonymous
  • anonymous
which is area of both circles plus the area of the rectangle
anonymous
  • anonymous
yes
anonymous
  • anonymous
hold on wrong chat
anonymous
  • anonymous
that i am get ing i have not did this in a long time
anonymous
  • anonymous
Surface Area = 2(pi r 2) + (2 pi r)* h
anonymous
  • anonymous
yes..
anonymous
  • anonymous
ok?
anonymous
  • anonymous
sorry was gone
anonymous
  • anonymous
dk?
anonymous
  • anonymous
help?
anonymous
  • anonymous
yes with what
anonymous
  • anonymous
???
anonymous
  • anonymous
same question
anonymous
  • anonymous
Surface Area = 2(pi r 2) + (2 pi r)* h

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