Top Posters
Since Sunday
r
4
L
4
3
d
3
M
3
l
3
V
3
s
3
d
3
a
3
g
3
j
3
Home Q & A Board Science-Related Homework Help Mathematics
New Topic  
feeju feeju
wrote...
Go to Answer
Posts: 7
Rep: 0 0
12 years ago
How do I go about this question. 43m of fencing, and 3 out of 4 sides are closed in. What dimensions will give me the most area (apparently the answer is 11.5m * 23m), but how did they get that? Please show all formulas and work.
Read 383 times
2 Replies
Replies
Answer accepted by topic starter
MikeLakeMikeLake
wrote...
#1
Posts: 43
Rep: 1 0
12 years ago
Sign in or Sign up in seconds to unlock everything for free
1

Related Topics

wrote...
#2
12 years ago
did u not mean 46m fencing?..in which case let 2 sides have length a..other side=46-2a..
>enclosed area A=(46-2a)*a=46a-4a^2..dA/da=46-4a.. max a when dA/da=0..ie a=11.5m
> other side has dim=46-2a=23m..and A enclosed=23*11.5
or if u bend fence in2 semicirc, u can 'enclose' A=pir^2/2=pi/2*(43/pi)^2=43^2/(2*pi)= 294.28m^2
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1814 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Related Images
  
 4492
  
 1003
  
 2343
Your Opinion
Who's your favorite biologist?
Votes: 608
Previous poll results: Should Ph.D.'s be addressed as doctors?