09 AUG 2014 by ideonexus

 Survey, Question, Read, Recite, and Review (SQR3)

Survey The first step, survey or skim, advises that one should resist the temptation to read the book and instead glance through a chapter in order to identify headings, sub-headings and other outstanding features in the text. This is in order to identify ideas and formulate questions about the content of the chapter. Question Formulate questions about the content of the reading. For example, convert headings and sub-headings into questions, and then look for answers in the content of the ...
Folksonomies: education
Folksonomies: education
  1  notes
 
29 MAY 2014 by ideonexus

 The Kiss Precise

Four circles to the kissing come, The smaller are the benter. The bend is just the inverse of The distance from the centre. Though their intrigue left Euclid dumb There's now no need for rule of thumb. Since zero bend's a dead straight line And concave bends have minus sign, The sum of squares of all four bends Is half the square of their sum.
Folksonomies: mathematics poetry
Folksonomies: mathematics poetry
  1  notes

If four circles A, B, C, and D, of radii r1, r2, r3, and r4, are drawn so that they do not overlap but each touches the other three, and if we let b1 = 1/r1, etc., then

(b1 b2 b3 b4)^2 = 2(b1^2 b2^2 b3^2 b4^2).