Tuesday, 9 January 2018
products of primes
the powerpoint is here [ it needs to be downloaded for the animations to work ] what is the common form of these pairs of number...
Monday, 8 January 2018
these questions are from CBSE (India) Y10 papers the top left question leads to the cosine rule cos(180 - B) = - cos B
Tuesday, 2 January 2018
straight line graphs with ratio
Martin Wilson, of Harrogate, UK developed this idea to intermingle straight line graphs with ratios it might be interesting to compare stu...
the powerpoint is here
biggest square inside a right angled triangle
a good, if demanding, application of similar triangles general cases proving a general result what are the steps? ...
Monday, 18 December 2017
the proof that there are only five equable triangles (integer sided) was done in 1904 this version of a proof is largely due to David Well...
equable right angled triangles
not using pythagoras working out the radius of the incircle three little triangles sum to the large one an alternative method, usi...
Tuesday, 12 December 2017
equable isosceles triangles
the area value = perimeter value for isosceles triangles (including an equilateral triangle, in Q2) with integer heights this work involv...
Friday, 8 December 2017
beginning to appreciate that all tangential polygons with an incircle radius = 2 are equable set A = P and solve the equation ignore ...
View web version