Hi Max, yes, I learned this in 10th grade geometry. Just a few years ago 1963, seems like yesterday. Lenny ----- Original Message ----- From: "Max Robinson" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, April 28, 2007 8:42 PM Subject: Re: (more information)[BlindHandyMan] calculating the area of a triangle
This is known as Newton's method. Presumably old Izik invented it. The first desk top electronic calculator I ever saw had a CRT for readout and used that method for finding square roots. You had to enter a guess as well as the number you wanted the square root of. The display showed the two numbers getting closer and closer together as the process progressed. It took about a minute to find a square root. Things have come a long way, haven't they. Regards. Max. K 4 O D S. Email: [EMAIL PROTECTED] Transistor site http://www.funwithtransistors.net Vacuum tube site: http://www.funwithtubes.net Music site: http://www.maxsmusicplace.com To subscribe to the fun with tubes group send an email to, [EMAIL PROTECTED] ----- Original Message ----- From: "Lenny McHugh" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Saturday, April 28, 2007 9:46 AM Subject: Re: (more information)[BlindHandyMan] calculating the area of a triangle > Hi David and all, > The formulas mention finding the square root. Since my talking calculater > does not have the square root function built in I use this technique. Hope > my math is correct and that it is written well enough. > Lenny > The perfect squares are obvious for example 3 squared is 9, 4 squared is > 16, > 5 squared is 25 > > If the number is not a perfect square this is one fairly easy way to > estimate the root > > > > 1. First find the closest squares that surround your number. > > 2. Divide your number by one of those square roots. > > > > 3. Calculate the average of the result of step 2 and the root. > > > > 4. By using the value calculated in step 3, repeat steps 2 and 3 until you > have an accurate number. > > > > Problem: Calculate the square root of 10. > > > > 1. Locate the two closest surrounding perfect squares. > > Solution: > > > > 1. 3squared = 9 and 4squared = 16, the surrounding perfect squares. > > 2. Divide 10 by 3. 10/3 = 3.3333, round off to 3.33. > > > > 3. Average 3.33 and 3. (3.33 + 3)/2 = 3.165 > > > > Repeat step 2: 10/3.165 = 3.159 > > Repeat step 3: Average 3.159 and 3.165. (3.159 + 3.165)/2 = 3.162 > > > > Answer: > > 3.1623 squared equal to 10? 3.162 x 3.162 = 9.998 > > > > If this is not accurate enough for you, you repeat steps 2 and 3. > > > > ----- Original Message ----- > From: "David Ferrin" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Saturday, April 28, 2007 12:33 AM > Subject: Re: [BlindHandyMan] calculating the area of a triangle > > > Well I don't claim to understand either of these formulas very much but I > have combined both of these posts in to a single file. The first method > uses > the vertical sides being equal where the second none of the sides are > equal > at all. I invite you guys to check out my handy work, but I didn't change > any of the mathematical information. > > http://www.jaws-users.com/handyman/CalculatingTheAreaOfATriangle.html > > David Ferrin > Never purchase the first version of anything. This message brought to you > by > Windows Vista. Smart Computing March 2007 > ----- Original Message ----- > From: "Michael Baldwin" <[EMAIL PROTECTED]> > To: <[email protected]> > Sent: Friday, April 27, 2007 10:35 PM > Subject: RE: [BlindHandyMan] calculating the area of a triangle > > > David, > There are two methods for calculating the area of a triangle that I know > of. > First method works best if it is a right triangle, one angle is a 90 > degree > angle. > Area equals base times the height divided by two. > A triangle with a base of 3 inches, height of 4 inches would be > A=(3*4)/2 > A=12/2 > A=6 > The area would be 6 square inches. > The second method works better if you do not know the height, or do not > feel > like figuring the height. > First figure up the perimeter of the triangle. This example we will use a > triangle with side A 15 inches, side B 10 inches, and side C 7 inches. > Perimeter equals A plus B plus C > P=15+10+7 > P=32 > Now for the area > Area equals the square route of the perimeter divided by 2 times the > perimeter divided by 2 minus side A times the perimeter divided by 2 minus > side B times the perimeter divided by 2 minus side c > A=sqt((32/2)((32/2)-15)((32/2)-10)((32/2)-7)) > A=sqt(16(16-15)(16-10)(16-7)) > A=sqt(16*1*6*9) > A=sqt(864) > A=29.39 square inches. > > Michael > > > > -----Original Message----- > From: [email protected] [mailto:[EMAIL PROTECTED] > On Behalf Of David Ferrin > Sent: Friday, April 27, 2007 20:24 > To: [email protected] > Subject: [BlindHandyMan] calculating the area of a triangle > > Would somebody please try posting this information again but in English > this > time? I'd like to put it up on the web, unfortunately never having > trigonometry none of it made any sense to me enough to code in an HTML > file > at least. Also please use an example to explain the formula. > David Ferrin > Never purchase the first version of anything. This message brought to you > by > Windows Vista. 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Groups Links > > > > > > > To listen to the show archives go to link > http://acbradio.org/handyman.html > or > ftp://ftp.acbradio.org/acbradio-archives/handyman/ > > The Pod Cast address for the Blind Handy Man Show is. > http://www.acbradio.org/news/xml/podcast.php?pgm=saturday > > The Pod Cast address for the Cooking In The Dark Show is. > http://www.gcast.com/u/cookingindark/main.xml > > Visit The Blind Handy Man Files Page To Review Contributions From Various > List Members At The Following address: > http://www.jaws-users.com/handyman/ > > Visit the new archives page at the following address > http://www.mail-archive.com/[email protected]/ > For a complete list of email commands pertaining to the Blind Handy Man > list just send a blank message to: > [EMAIL PROTECTED] > Yahoo! Groups Links > > > > > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.5.467 / Virus Database: 269.6.2/779 - Release Date: 4/28/2007 > 3:32 PM > > To listen to the show archives go to link http://acbradio.org/handyman.html or ftp://ftp.acbradio.org/acbradio-archives/handyman/ The Pod Cast address for the Blind Handy Man Show is. http://www.acbradio.org/news/xml/podcast.php?pgm=saturday The Pod Cast address for the Cooking In The Dark Show is. http://www.gcast.com/u/cookingindark/main.xml Visit The Blind Handy Man Files Page To Review Contributions From Various List Members At The Following address: http://www.jaws-users.com/handyman/ Visit the new archives page at the following address http://www.mail-archive.com/[email protected]/ For a complete list of email commands pertaining to the Blind Handy Man list just send a blank message to: [EMAIL PROTECTED] Yahoo! 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