February 9th, 2019, 04:03 PM  #1 
Newbie Joined: Feb 2019 From: Central PA Posts: 4 Thanks: 0  Triangle question from a Math "Dummy"?
No math background... But need help. What is the "?ft." measurement? Any questions? Thanks! 
February 10th, 2019, 12:28 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 20,472 Thanks: 2039 
The area of a triangle can be calculated as half its base multiplied by its height. If the desired width is x feet, 43*21/2 = 43*8/2 + 21*x/2, so x = 43*13/21. 
February 10th, 2019, 04:05 AM  #3 
Newbie Joined: Feb 2019 From: Central PA Posts: 4 Thanks: 0  Graybox?
I fear I may not be asking the right question.* Let me try to clarify... What are the dimensions of the "graybox"?* Given is the 8ft. side by ???*
Last edited by skipjack; February 10th, 2019 at 06:59 AM. 
February 10th, 2019, 05:57 AM  #4 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,314 Thanks: 1023 
longersideof"graybox" = 43  344/21 = ~26.62 ft. If you want to understand why, google "right triangles" and "similar triangles". If you have more questions, come back with a labelled diagram so we can clearly refer to it... Last edited by skipjack; February 10th, 2019 at 06:42 AM. 
February 10th, 2019, 06:51 AM  #5 
Global Moderator Joined: Dec 2006 Posts: 20,472 Thanks: 2039 
I happened to use the word "width" rather than "length", but the value 43*13/21 is correct. As a mixed fraction, it's 26 13/21.

February 10th, 2019, 02:34 PM  #6 
Newbie Joined: Feb 2019 From: Central PA Posts: 4 Thanks: 0  26.62 ft.
26.62 ft. it is... Thanks!

February 10th, 2019, 02:53 PM  #7 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,314 Thanks: 1023 
That's 26 feet and 7.44 inches.... Are you a carpenter building something? 
February 10th, 2019, 03:03 PM  #8 
Global Moderator Joined: Dec 2006 Posts: 20,472 Thanks: 2039 
7.43

February 10th, 2019, 03:31 PM  #9  
Newbie Joined: Feb 2019 From: Central PA Posts: 4 Thanks: 0  Reason... Quote:
Attached: Inside the RED circle is a building/plotplan. The arrow points to the "triangle" of land. I want to add an 8ft. secondstory deck, and needed to know how long I can build an 8ft. deck.  
February 10th, 2019, 03:32 PM  #10 
Math Team Joined: Oct 2011 From: Ottawa Ontario, Canada Posts: 14,314 Thanks: 1023 
7.4285714285695


Tags 
dummy, math, question, triangle 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Math Homework Help "Extend and Challenge" Questions  Tzad  Algebra  14  September 14th, 2013 06:34 PM 
A "simple" application of dirac delta "shift theorem"...help  SedaKhold  Calculus  0  February 13th, 2012 11:45 AM 
"separate and integrate" or "Orangutang method"  The Chaz  Calculus  1  August 5th, 2011 09:03 PM 
sample exerimentneed help finding "statistic" and "result"  katie0127  Advanced Statistics  0  December 3rd, 2008 01:54 PM 