a lesser-known proof of pythagoras' theorem (or why right-angled triangles are like 'russian' dolls)
thinkingmakesitso
a lesser-known proof of pythagoras' theorem (or why right-angled triangles are like 'russian' dolls)
1:31
balanced ternary (or the 'prettiest' number base)
thinkingmakesitso
balanced ternary (or the 'prettiest' number base)
2:19
how many numbers can you make in n steps of doubling and adding 1? fibonacci?!
thinkingmakesitso
how many numbers can you make in n steps of doubling and adding 1? fibonacci?!
2:04
what numbers survive 'halving and subtracting one' the longest?
thinkingmakesitso
what numbers survive 'halving and subtracting one' the longest?
2:45
visualising de morgan's rules (why the opposite of 'and' is 'or')
thinkingmakesitso
visualising de morgan's rules (why the opposite of 'and' is 'or')
1:41
a, b, a and b, a or b... where does it end?
thinkingmakesitso
a, b, a and b, a or b... where does it end?
2:09
the geometry of roots of unity
thinkingmakesitso
the geometry of roots of unity
2:42
the secret behind the law of sines
thinkingmakesitso
the secret behind the law of sines
3:38
a little-known fact about quadrilaterals
thinkingmakesitso
a little-known fact about quadrilaterals
1:13
what the 2d determinant ad - bc has to do with area
thinkingmakesitso
what the 2d determinant ad - bc has to do with area
2:15
areas of quadrilaterals by dissection
thinkingmakesitso
areas of quadrilaterals by dissection
2:04
the why of exact trig values
thinkingmakesitso
the why of exact trig values
1:20
varignon's theorem
thinkingmakesitso
varignon's theorem
1:50
why perpendicular lines have m1m2 = -1
thinkingmakesitso
why perpendicular lines have m1m2 = -1
3:54
why sin(2x)=2sin(x)cos(x)
thinkingmakesitso
why sin(2x)=2sin(x)cos(x)
1:29
the british flag theorem
thinkingmakesitso
the british flag theorem
2:08
de gua's theorem (higher dimensional pythagoras)
thinkingmakesitso
de gua's theorem (higher dimensional pythagoras)
3:44
euclid's beautiful arguments for propositions XXXV through XXXVIII
thinkingmakesitso
euclid's beautiful arguments for propositions XXXV through XXXVIII
4:04
vertically opposite angles
thinkingmakesitso
vertically opposite angles
0:55
angles in a triangle - 3 proofs
thinkingmakesitso
angles in a triangle - 3 proofs
0:53
how to visualise trig addition formulae
thinkingmakesitso
how to visualise trig addition formulae
3:24
the inscribed angle theorem
thinkingmakesitso
the inscribed angle theorem
4:12
thales' theorem
thinkingmakesitso
thales' theorem
1:40
the geometry behind integration by parts
thinkingmakesitso
the geometry behind integration by parts
2:19
the twelve days of christmas
thinkingmakesitso
the twelve days of christmas
3:56
plato's number
thinkingmakesitso
plato's number
1:36
paths on a lattice (or how many ways from A to B in d dimensions) #SoME2
thinkingmakesitso
paths on a lattice (or how many ways from A to B in d dimensions) #SoME2
14:25
polite numbers
thinkingmakesitso
polite numbers
8:53
finding the odd one out (or Captain Holt's unsolved riddle)
thinkingmakesitso
finding the odd one out (or Captain Holt's unsolved riddle)
14:20