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janessia

  • 2 years ago

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

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  1. janessia
    • 2 years ago
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    @jim_thompson5910 i got 753 and i did all the steps but no right answer... help me?

  2. jim_thompson5910
    • 2 years ago
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    Area of the base = ???

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

  4. janessia
    • 2 years ago
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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

  5. janessia
    • 2 years ago
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    @jim_thompson5910 am i right?

  6. jim_thompson5910
    • 2 years ago
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    yes

  7. jim_thompson5910
    • 2 years ago
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    now multiply that with the height

  8. janessia
    • 2 years ago
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    2260.8

  9. jim_thompson5910
    • 2 years ago
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    then divide by 3

  10. janessia
    • 2 years ago
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    i still got 753.6!

  11. janessia
    • 2 years ago
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    thats wrong!

  12. jim_thompson5910
    • 2 years ago
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    ok which matches to which answer

  13. jim_thompson5910
    • 2 years ago
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    i know, each answer has a pi in it

  14. jim_thompson5910
    • 2 years ago
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    one of those answers is roughly equal to 753.6

  15. janessia
    • 2 years ago
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    720

  16. janessia
    • 2 years ago
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    ?

  17. jim_thompson5910
    • 2 years ago
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    no, try doing the calculations without 3.14 and use pi instead

  18. janessia
    • 2 years ago
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    k

  19. janessia
    • 2 years ago
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    i really dont know i did and i got 753.98223687 this time

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

  21. janessia
    • 2 years ago
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    i dont have my graphing calc right now so im using a scientific one right now

  22. janessia
    • 2 years ago
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    but ohk yes i got 36

  23. phi
    • 2 years ago
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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

  24. janessia
    • 2 years ago
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    i got 240 woowww how'd yo do that... how was i getting 753?

  25. janessia
    • 2 years ago
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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

  26. phi
    • 2 years ago
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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.

  27. phi
    • 2 years ago
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    Yes to b. 80 cu. ft

  28. janessia
    • 2 years ago
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    oh ohk thanks a lot can you check my answer above?

  29. janessia
    • 2 years ago
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    thanks :)

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