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janessia Group Title

Find the volume of a cone with radius 6 m and height 20 m. Choose one answer. a. 720π m^3 b. 240π m^3 c. 120π m^3 d. 40π m^3

  • one year ago
  • one year ago

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  1. janessia Group Title
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    @jim_thompson5910 i got 753 and i did all the steps but no right answer... help me?

    • one year ago
  2. jim_thompson5910 Group Title
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    Area of the base = ???

    • one year ago
  3. phi Group Title
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    Did you use \[ V= \frac{1}{3} \pi r^2 h \]

    • one year ago
  4. janessia Group Title
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    @jim_thompson5910 sorry i had to run some errands for my mom but the area of the base is 113.04

    • one year ago
  5. janessia Group Title
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    @jim_thompson5910 am i right?

    • one year ago
  6. jim_thompson5910 Group Title
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    yes

    • one year ago
  7. jim_thompson5910 Group Title
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    now multiply that with the height

    • one year ago
  8. janessia Group Title
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    2260.8

    • one year ago
  9. jim_thompson5910 Group Title
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    then divide by 3

    • one year ago
  10. janessia Group Title
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    i still got 753.6!

    • one year ago
  11. janessia Group Title
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    thats wrong!

    • one year ago
  12. jim_thompson5910 Group Title
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    ok which matches to which answer

    • one year ago
  13. jim_thompson5910 Group Title
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    i know, each answer has a pi in it

    • one year ago
  14. jim_thompson5910 Group Title
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    one of those answers is roughly equal to 753.6

    • one year ago
  15. janessia Group Title
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    720

    • one year ago
  16. janessia Group Title
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    ?

    • one year ago
  17. jim_thompson5910 Group Title
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    no, try doing the calculations without 3.14 and use pi instead

    • one year ago
  18. janessia Group Title
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    k

    • one year ago
  19. janessia Group Title
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    i really dont know i did and i got 753.98223687 this time

    • one year ago
  20. phi Group Title
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    when you find the area using \[ \pi r^2\] leave pi in. do not use 3.14 you get \[ 36 \pi\]

    • one year ago
  21. janessia Group Title
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    i dont have my graphing calc right now so im using a scientific one right now

    • one year ago
  22. janessia Group Title
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    but ohk yes i got 36

    • one year ago
  23. phi Group Title
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    V= 1/3 pi r^2 h if you leave the pi to one side: \[ \pi (\frac{1}{3} 36 \cdot h )\] just figure out the stuff in the parens

    • one year ago
  24. janessia Group Title
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    i got 240 woowww how'd yo do that... how was i getting 753?

    • one year ago
  25. janessia Group Title
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    I got B for this is that right? Find the volume of a square pyramid with base edges 4 ft. and height 15 ft. Choose one answer. a. 20 cu. ft b. 80 cu. ft c. 240 cu. ft d. 60 cu. ft

    • one year ago
  26. phi Group Title
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    the answer is \[ 240 \cdot \pi \] 240 times pi if you replace pi with 3.14159... you get 753. with lots of decimals people just write it 240 pi and if someone wants the exact number, they can multiply it out themselves.

    • one year ago
  27. phi Group Title
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    Yes to b. 80 cu. ft

    • one year ago
  28. janessia Group Title
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    oh ohk thanks a lot can you check my answer above?

    • one year ago
  29. janessia Group Title
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    thanks :)

    • one year ago
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