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anonymous

  • 5 years ago

Please help I don't understand this at all..... on this would i do 82*pi/1:4, and 42*pi/1:8? The solid described is similar to a large solid with the given scale factor. Find the surface area and volume of a larger solid. A right prism with a surface area of 82 square feet and a volume of 42 cubic feet; scale factor 1:2: square

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  1. dumbcow
    • 5 years ago
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    Yes you have the right idea. But you dont need to multiply by pi if the are and volume are already given

  2. anonymous
    • 5 years ago
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    so how would i do 1:4

  3. dumbcow
    • 5 years ago
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    if the smaller solid has area of 82 then multiply by 4, if 82 refers to the larger then divide by 4 to get the smaller solids area.

  4. dumbcow
    • 5 years ago
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    i am assuming the ratio is 1:2 for side length

  5. anonymous
    • 5 years ago
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    it just says the scale factor is 1:2

  6. dumbcow
    • 5 years ago
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    ok a prism with sides length twice as long will have 4X the area so we are ok

  7. anonymous
    • 5 years ago
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    ok.. so i do 82*4

  8. anonymous
    • 5 years ago
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    328, but i dont have to use pi?

  9. dumbcow
    • 5 years ago
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    no and for volume multiply by 8

  10. anonymous
    • 5 years ago
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    so 336

  11. dumbcow
    • 5 years ago
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    we only need to use pi when calculating area/perimeter/volume of a circle

  12. anonymous
    • 5 years ago
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    oh okay

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