anonymous
  • anonymous
surface area of a cylinder?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
Surface Area = 2(pi r 2) + (2 pi r)* h
anonymous
  • anonymous
a tin soup is in the shape of a cylinder. it has a radius of 3cm and its height is 12cm. the tin has a label which fits exactly around the cylinder with no overlap. calculate the area of the label with 3 significant figures.
jiteshmeghwal9
  • jiteshmeghwal9
\(\Large{2 \pi rh+2\pi r^2}\)

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anonymous
  • anonymous
2(pi 3^2)+(2pi 3)x12
anonymous
  • anonymous
what does the arrow mean that goes upwards?
anonymous
  • anonymous
Cylinder: Two circles and the curved surfaces Area of Circle: pi*r^2 Area of curved surface: circumference of ^ circle * height of cylinder circumference: 2*pi*r so area of curved surface: 2*pi*r*h Total area: 2*pi*r^2 + 2*pi*r*h =2*pi*r(r+h)
anonymous
  • anonymous
The ^ means to the power of e.g. 5^2 = 25
anonymous
  • anonymous
oh thanks!
anonymous
  • anonymous
In your question, the label is the area of the 'curved surface'. Which we showed to be 2*pi*r*h
anonymous
  • anonymous
thank you @apple_pi
anonymous
  • anonymous
sure, anytime

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