A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 5 years ago
i need someone to explaim how to figure surface areas of a cone
anonymous
 5 years ago
i need someone to explaim how to figure surface areas of a cone

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0Is it closed on the bottom of the cone? If so, the surface area is:\[SA = \pi*r*s+\pi*r^2\] where "s" is the length from the tip of the cone to the outer edge of the base. If it's an open cone, you can get rid of the pi*r^2 term.

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0circumference of the base integrated thru the height, if that makes sense :)

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0height for any given piece is (2y) circumference for any given piece is (2pi(x)) x = (7/2) y So; 2pi(7/1)y dy from 0 to 2.... might need a second pair of eyes on that tho :)

amistre64
 5 years ago
Best ResponseYou've already chosen the best response.0.... 7pi (S) (y)(2y) dy  0,2 7pi (S) 2y  y^2 dy  0,2 7pi; y^2  (y^3)/3  0,2 .... only (2) matters 7pi; 2^2  (2^3)/3 7pi (4  (8/3)) = (12/3  8/3) 7pi (4/3) = 28pi/3 ; we can toss the () because it just means we used the wrong "side" and we are left with.. 28pi/3 ..... of which I have no idea if ii did it correctly :)
Ask your own question
Sign UpFind 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
 Engagement 19 Mad Hatter
 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.