Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

alainabbyboo22

  • 2 years ago

Find the surface area of the figure below. A. 203.1 ft2 B. 301.59 ft2 C. 318.74 ft2 D. 395.84 ft2 i am so confused on this .. i am trying to use the c^2=b^2 and a^2 different ways but its just not working out . what am i doing wrong ?

  • This Question is Closed
  1. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    1 Attachment
  2. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @gaara438125

  3. gaara438125
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    we need to find the height first, which i believe we already found was 16.16 correct?

  4. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    this is a completely different question than before . lol . i'm so unsure with this one .

  5. gaara438125
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ok i see what's different :P we need to find a side (the height) we know the hypotenuse (the slant) and one side so b^2 = c^2 - a^2 c = 15 a = 6

  6. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    my answer was 189 . what do i do from there ? because that answer isn't available in the answer choices .

  7. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @gaara438125 @JakeV8 @Grim0519

  8. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    You were close... just not done with the last step on finding that length: b^2 = c^2 - a^2 c = 15 a = 6 b^2 = 225 - 36 b^2 = 189 But you want "b", not "b squared"... you forgot to take the square root of 189.

  9. mayankdevnani
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    do you know the surface area of cone=?

  10. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    But then, yeah, you need surface area, not just the length of the outside edge. I don't have that formula handy...

  11. mayankdevnani
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    you are right @JakeV8

  12. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    the square root of 189 is : 13.7477270849

  13. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    I'm not sure you needed to find that after all... but good practice with the pythagorean theorem :) The formula for surface area of a cone needs the diagonal length, not the height. The formula I found online (yay Internet!) was: pi * r^2 + pi * r * s where "r" is the radius (shown as 6) and "s" is the diagonal length of the cone's edge, (shown as 15).

  14. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    http://0.tqn.com/d/math/1/0/t/L/conerr.jpg

  15. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    woot woot ! got my answer (: 395.84 ft^2 (: (: (:

  16. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Good work... you just needed to use the formula.

  17. alainabbyboo22
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thank you so much for helping me out (:

  18. JakeV8
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 1

    Glad to help :)

  19. Not the answer you are looking for?
    Search for more explanations.

    Search OpenStudy
    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.