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mckenzieandjesus

  • one year ago

What is the surface area of the cone? 175π cm2 224π cm2 147π cm2 273π cm2

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  1. mckenzieandjesus
    • one year ago
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  2. mckenzieandjesus
    • one year ago
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    im using this site http://www.web-formulas.com/Math_Formulas/Geometry_Surface_of_Cone.aspx but got the wrong answer and kind of confused how to put it all in the formula..

  3. NathalyN
    • one year ago
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    A=πr(r+h2+r2)

  4. jdoe0001
    • one year ago
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    \(\large \textit{volume of a cone}=\cfrac{\pi r^2 h}{3}\qquad \begin{cases} r=radius\\ h=height \end{cases} \)

  5. jdoe0001
    • one year ago
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    hmm shoot .. surface area... ok

  6. mckenzieandjesus
    • one year ago
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    13891 9/25?

  7. mckenzieandjesus
    • one year ago
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    @NathalyN

  8. jdoe0001
    • one year ago
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    \(\bf \textit{total surface area of a cone}=\pi r\sqrt{r^2+h^2}+\pi r^2\qquad \begin{cases} r=radius\\ h=height \end{cases} \)

  9. mckenzieandjesus
    • one year ago
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    16909.214?

  10. mckenzieandjesus
    • one year ago
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    or 703.36 those are the answers im getting..

  11. jdoe0001
    • one year ago
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    hmm so.. which one did you get?

  12. mckenzieandjesus
    • one year ago
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    so \[3.14*7\sqrt{7^{2}}+24^{2} + 3.14*7^2 =\] 16909.214

  13. mckenzieandjesus
    • one year ago
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    yeah and i got that answer u got by doing it another way.. but none of those are on my answer choices..

  14. mckenzieandjesus
    • one year ago
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    @jim_thompson5910

  15. jdoe0001
    • one year ago
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    ohh hmmm your choices are in \(\huge \pi\) terms thus... you need to keep the \(\huge \pi\) without multiplying it

  16. mckenzieandjesus
    • one year ago
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    so how do i do that?

  17. jdoe0001
    • one year ago
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    well.. just don't multiply the \(\pi\) and keep it as is, as a variable per se

  18. mckenzieandjesus
    • one year ago
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    \[7*\sqrt{7^2+24^2} + 3.14*7^2\]

  19. mckenzieandjesus
    • one year ago
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    or wait..

  20. jdoe0001
    • one year ago
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    one sec

  21. mckenzieandjesus
    • one year ago
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    \[7*\sqrt{7^2+24^2} * 7^2 = 8575\]

  22. mckenzieandjesus
    • one year ago
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    okay.. still lost

  23. jdoe0001
    • one year ago
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    hmmm have a typo there one sec \(\bf \textit{total surface area of a cone}=\pi r\sqrt{r^2+h^2}+\pi r^2\qquad \begin{cases} r=radius\\ h=height \end{cases} \\ \quad \\ \pi r\sqrt{r^2+h^2}+\pi r^2\implies \pi r(\sqrt{r^2+h^2}+r)\impliedby \textit{common factor} \\ \quad \\ \begin{cases} r=7\\ h=24 \end{cases}\implies \pi \cdot 7(\sqrt{7^2+24^2}+7)\implies \square ?\pi \)

  24. mckenzieandjesus
    • one year ago
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    224?

  25. jdoe0001
    • one year ago
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    yeap

  26. mckenzieandjesus
    • one year ago
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    thank you

  27. jdoe0001
    • one year ago
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    so in \(\pi\) terms is \(\large 224\pi\)

  28. mckenzieandjesus
    • one year ago
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    Can u finish helping me on my other question please?

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