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tahtah99 Group Title

The height of an equilateral rectangular prism decreases by two units. The new lateral area is less than the original by how much? Answer two times the area of the base two times the perimeter of the base two less than the the area of the base two less than the perimeter of the base I think it is C but im not sure

  • 2 years ago
  • 2 years ago

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  1. darthsid Group Title
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    What's the formula for the area of the prism?

    • 2 years ago
  2. tahtah99 Group Title
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    mmm im not sure

    • 2 years ago
  3. tahtah99 Group Title
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    b*h

    • 2 years ago
  4. darthsid Group Title
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    |dw:1331785747771:dw|

    • 2 years ago
  5. darthsid Group Title
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    That's a rectangular prism. The lateral surface area is the area of the 4 sides, not including the base and the top.

    • 2 years ago
  6. darthsid Group Title
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    so the formula for the lateral surface area is Perimeter of base X height

    • 2 years ago
  7. darthsid Group Title
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    Now, if the new height is decreased by two, so it is h-2 so the area is : P x (h-2)

    • 2 years ago
  8. darthsid Group Title
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    are you understanding so far?

    • 2 years ago
  9. tahtah99 Group Title
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    yessss

    • 2 years ago
  10. darthsid Group Title
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    \[P \times ( h-2) = P \times h - P \times 2\]

    • 2 years ago
  11. tahtah99 Group Title
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    so it would be D ?

    • 2 years ago
  12. darthsid Group Title
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    But, P x h is the area of the original prism! the above equation basically says: New Area = Old Area - P x 2

    • 2 years ago
  13. darthsid Group Title
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    No, P x 2 means Perimeter times 2

    • 2 years ago
  14. tahtah99 Group Title
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    b?

    • 2 years ago
  15. darthsid Group Title
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    yeah, it's B

    • 2 years ago
  16. tahtah99 Group Title
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    thank you once again : )

    • 2 years ago
  17. darthsid Group Title
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    Glad to help, good luck!

    • 2 years ago
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