A4 paper ratio
Filed in Notes, Maths on May 16th 05 .
The A series of paper sizes (and the B series come to that) have the property that when you fold a sheet in half with the fold parallel to the short side, the ratio of the sides remains the same. This means that the sides must be in the ratio 1:1.414. The algebra is sketched below (on a 5 by 3 inch record card scanned at 75 dpi).
This is one of the most accessible situations I know of where a quadratic equation (a very simple one) can be set up and solved.
This is filed under Notes, Maths. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are closed for this post.
[ bodmas home ]
-
Bodmas features
- RBL Wikispace
- Moodle
- E-learning notes
-
Pages
-
Categories
-
Recent posts
-
Archives
- October 2006
- September 2006
- August 2006
- July 2006
- June 2006
- May 2006
- April 2006
- March 2006
- February 2006
- January 2006
- December 2005
- November 2005
- October 2005
- September 2005
- August 2005
- July 2005
- June 2005
- May 2005
- April 2005
- March 2005
- February 2005
- January 2005
- December 2004
- November 2004
- October 2004
-
Blackboard and DOPA
- Another patent...
- AoC on DOPA
- BECTa advice
- History of VLEs
- Michael Feldstein's blog
-
ILT
- All Things Wiki
- Andy's Black Hole
- Blog Technology blog
- Clive on Learning
- Dick Willis
- EdTechUK
- edugeeks
- FERL @ BECTa
- Fordlog
- Full circle online interaction blog
- Jane's e-learning pick of the day
- Mac OS X tips
- Moodle Training Blog
- moodle.org
- Moodlebug
- MoodleMoot UK
- Open Source Web Design
- Podcasting in Ireland
- Presentation Zen
- Seb Schmoller
- wikispaces
- Yotophoto
-
Journalist Blogs
- Bill Thompson
- BuzzMachine
- Healing Irag
- Kieren McCarthy
- Roy Greenslade
-
Maths
- 2nd July
- Artifacts of Computation
- Blogging for Numeracy
- Casting out nines
- Cut the Knot
- Dotty paper
- Gallery of Computation
- Mathworld
- Numeracy for Health
- Skills Workshop
- Special Graph paper grids
- The Geometry Junkyard
-
Misc
- A Few Things Ill Considered
- Bartleby reference
- BBC Learning Styles survey
- Explorations in Learning
- G24
- Overgrown Path
- Primary Teacher UK
- Real Climate
- UK Phenology Network
- Ways of Knowing
- Wikipedia (English)
- WordPress
-
Playtime
- 55 Ways to Have fun with Google
- GUI Gallery
- Guido Fawkes
- Hitchhiker's Moon
- Inconstant Moon
- Kiev Ephemeris
- Magnatune
- Penny Illustrated News
- Post-Modern generator
- Project Redsand
- Sofa Sound
- Spell with Flickr
- Think Link
- Waterfall 2006
- Wordcount
-
Vital software
- Audacity
- Audio Hijack
- AVG virus checker
- ClamXav
- Disable spotlight
- EasyWMA
- Express Scribe
- LaTeX Equation Editor
- Mellel
- Open Office
- PDFLab
- Processing 1.00 [ beta ]
- Seamonkey
- Smultron
- ST 330 drivers
- Stuffit expander
- Tinderbox
- Vienna RSS reader
- Writeroom
-
Web applications
- Remember the milk
- Resize pictures on the Web
- ScanR
- Score your password
-
Themes
-
Meta
- Login
- XFN
- WordPress
-
Tags
- maths+resources
- maths+teaching
- elearning
Site delivered by WordPress
© Content Keith Burnett, 2006. This old school table-based layout was devised to support a Web authoring module. Mind you, it loads quicker than Kubrick in Safari...