
Home  Forums  Rules  Articles  diyAudio Store  Gallery  Wiki  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 

Please consider donating to help us continue to serve you.
Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving 

Thread Tools  Search this Thread 
12th March 2013, 09:53 PM  #11 
Speakerholic
diyAudio Moderator

Because the area of a trapezoid is
h(a+b)/2 where: h=height a=shorter of the parallel dimensions b=longer of the parallels 
12th March 2013, 09:56 PM  #12 
diyAudio Member
Join Date: Apr 2006
Location: MA

Math

12th March 2013, 09:58 PM  #13 
Speakerholic
diyAudio Moderator

Sorry, I'm supposed to have forgotten all this by my age.

12th March 2013, 10:08 PM  #14 
diyAudio Member

Shouldn't integrals work for this? Or am I wrong?
__________________
My audio and DIY blog: http://phimusic.blogspot.se/ 
12th March 2013, 10:12 PM  #15 
diyAudio Member
Join Date: Aug 2002
Location: victoria BC

for those with simple constant CSA just draw them out in CAD, and use the measure area function, snapping to intersection points, then times height
__________________
... so, not as easy at it sounds, this letting go thing 
12th March 2013, 10:13 PM  #16 
Speakerholic
diyAudio Moderator

Ghosts of departed quantities.

12th March 2013, 10:17 PM  #17 
frugalphile(tm)
diyAudio Moderator

Cal & X fighting over the use of the Associative property.
dave
__________________
community sites tlinespeakers.org, frugalhorn.com, frugalphile.com ........ commercial site planet10HiFi p10hifi forum here at diyA 
12th March 2013, 10:23 PM  #18 
Speakerholic
diyAudio Moderator

Associative property, really?
Is that what you get from the dimensions in post 1? 
12th March 2013, 10:25 PM  #19 
diyAudio Member

Has everyone actually forgotten there basic geometry? Cal, glad someones brain still works here and you go that right. Why would you have to use a cad program to figure this out? That is like asking what the area of a circle is! Now if we start talking about the sq. rt of 1 I imagine that many would not know the term i, but a simple trapezoid you could look that up on Google in two seconds. How do you do ac circuit work if you don't remember some basic math?

12th March 2013, 10:41 PM  #20 
diyAudio Member
Join Date: Oct 2012
Location: Metro DC area

I think we are on same thinking. Without a picture I interpreted trapezoid in the vertical dim with top wall and bottom wall being rectangular csa. I think you see this as a trapezoid csa on top and bottom wall of varying area  trapezoid in all dimensions. Not clear what op meant based on words. That's why we have diagrams. We are both right. Depends on interpretation. Heck op did not even give height. My formula of average areas on top and bottom multiplied by height applies to any cross section, round, trap, triangle, etc. As long as same type of cross section top and bottom.
Last edited by xrk971; 12th March 2013 at 10:44 PM. 
Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
box volume for sub  thefox  Subwoofers  5  29th December 2011 03:25 PM 
Parts Express knockdown trapezoid cabinets  cyclecamper  PA Systems  11  13th December 2011 10:39 PM 
Line Array Isosceles Trapezoid Question  dc270  MultiWay  5  3rd February 2006 06:25 AM 
Box volume  eitanwaks  MultiWay  7  19th April 2005 02:45 AM 
New To Site?  Need Help? 