Segar Rogers
/sē′gər/
Teacher. Maths. Secondary. Edinburgh.
Old enough to remember chalk.
Currently taking a sabbatical.
Occasional poetry.
- Proof of cot θ × tan θ = 1 … using the Out-In Complementary Principle. #UKMathsChat #iTeachMath
- This is the geometry in one of the diurnal problems from Brahmagupta's 7th century Khandakhādyaka. I've undertaken some repositioning to aid the aesthetic, and a little obfuscation to add to the challenge. #UKMathsChat #iTeachMath
- Reposted by Segar Rogers[Not loaded yet]
- Still in ratio table mode. I remembered this @mathforge.org ;-)
- Some 'aspects/rules' of ratio tables ... collected together as an aid to proportional reasoning. 'El. V–16' = Euclid's Elements Book 5 Proposition 16 #UKMathsChat #iTeachMath
- Related ratio tables?? Find what can be found. #UKMathsChat
- Nested ratio tables anyone?? Hmmm? #UKMathsChat
- A diagram for a diagram-less tradition; gradually making some sense of Brahmagupta's Khandakhadyaka. With a couple of shadow measurements and the angle of the rising sun he could calculate the time of day. Astonishing really.
