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Acarpenter2

  • one year ago

For the surface area of a rectangular prism do i have to double it because its a 3D shape? For example if the length of it is 12, the width 8 and the height 6. would the equation look like this: A= 2(8*12+6*12+6*8)? or would it look different.

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  1. sloppycanada
    • one year ago
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    So once you find the area of one side of the rectangle, multiply it by four. Then find the area of the sides. |dw:1435756930736:dw|

  2. sloppycanada
    • one year ago
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    So there are four x's that should be the same side of this is a rectangle. How would you solve for the y's.

  3. Acarpenter2
    • one year ago
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    I'm not trying to solve for y's i just wanted to know how to find the surface area of a 3D shape. also what if it didn't have a top?

  4. sloppycanada
    • one year ago
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    The surface area of something is every single side. since it's a 3D shape, it has... 6 faces. Hence why you need to find out what "y" equals in order to find the surface area of something. If it didn't have the top I don't think it'd be considered a 3D shape.

  5. Acarpenter2
    • one year ago
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    @sloppycanada buckets don't have tops does that mean there not 3D...... honestly think before you type.

  6. sloppycanada
    • one year ago
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    Yes, but they have bottoms... in which case, you'd still have to find the surface area of the bottom of the pail.

  7. Acarpenter2
    • one year ago
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    but so does the rectangular prism! it has a bottom and a top

  8. sloppycanada
    • one year ago
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    |dw:1435764803251:dw| How many faces does this have?

  9. Acarpenter2
    • one year ago
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    7 the 6 front sides and the inside

  10. Acarpenter2
    • one year ago
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    6 outsides not front sides

  11. sloppycanada
    • one year ago
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    No, we don't care about the inside. Pick up a box, a good ol' cardboard box. How many faces will that have when you prop it up?

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