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mrs.biersackxx

  • one year ago

A cylindrical well is 20 meters deep and has a diameter of 1.5 meters. Approximately how many cubic meters of soil were dug out to make the well? (Use π = 3.14.)

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  1. Vocaloid
    • one year ago
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    first find the radius

  2. mrs.biersackxx
    • one year ago
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    so is that half of 1.5?

  3. Vocaloid
    • one year ago
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    yup! that gives us 0.75

  4. Vocaloid
    • one year ago
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    then we use the formula v = (pi)(r^2)(h) where r = 0.75 and h = 20

  5. mrs.biersackxx
    • one year ago
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    ah ok

  6. Vocaloid
    • one year ago
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    and pi = 3.14

  7. mrs.biersackxx
    • one year ago
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    so then u multiply all of it?

  8. Vocaloid
    • one year ago
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    yeah

  9. mrs.biersackxx
    • one year ago
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    i got 47.1

  10. mrs.biersackxx
    • one year ago
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    i think its wrong

  11. Vocaloid
    • one year ago
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    nope, try again

  12. Vocaloid
    • one year ago
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    v = (3.14)*(20)*(.75)^2 = ?

  13. mrs.biersackxx
    • one year ago
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    Oh i think i did something wrong

  14. mrs.biersackxx
    • one year ago
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    agh idk what im doing wrong

  15. Vocaloid
    • one year ago
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    just multiply from left to right

  16. Vocaloid
    • one year ago
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    (3.14)*20 = ?

  17. mrs.biersackxx
    • one year ago
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    62.8

  18. Vocaloid
    • one year ago
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    good, now multiply that by (0.75)*(0.75)

  19. mrs.biersackxx
    • one year ago
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    35.33

  20. mrs.biersackxx
    • one year ago
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    OH I GOT IT

  21. Vocaloid
    • one year ago
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    good, thats your final answer ~

  22. mrs.biersackxx
    • one year ago
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    thanks ur simply amazing

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