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navpreet

  • 2 years ago

surface area of a cylinder?

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  1. huneya
    • 2 years ago
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    Surface Area = 2(pi r 2) + (2 pi r)* h

  2. navpreet
    • 2 years ago
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    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.

  3. jiteshmeghwal9
    • 2 years ago
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    \(\Large{2 \pi rh+2\pi r^2}\)

  4. huneya
    • 2 years ago
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    2(pi 3^2)+(2pi 3)x12

  5. navpreet
    • 2 years ago
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    what does the arrow mean that goes upwards?

  6. apple_pi
    • 2 years ago
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    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)

  7. apple_pi
    • 2 years ago
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    The ^ means to the power of e.g. 5^2 = 25

  8. navpreet
    • 2 years ago
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    oh thanks!

  9. apple_pi
    • 2 years ago
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    In your question, the label is the area of the 'curved surface'. Which we showed to be 2*pi*r*h

  10. navpreet
    • 2 years ago
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    thank you @apple_pi

  11. apple_pi
    • 2 years ago
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    sure, anytime

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