mscroggs.co.uk
mscroggs.co.uk

subscribe

Advent calendar 2018

12 December

There are 2600 different ways to pick three vertices of a regular 26-sided shape. Sometime the three vertices you pick form a right angled triangle.
These three vertices form a right angled triangle.
Today's number is the number of different ways to pick three vertices of a regular 26-sided shape so that the three vertices make a right angled triangle.

 

Show answer

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

List of all puzzles

Tags

elections symmetry taxicab geometry cryptic crossnumbers regular shapes unit fractions sums dodecagons coordinates squares perimeter sequences balancing division integration time spheres the only crossnumber dates pascal's triangle triangles parabolas shapes percentages irreducible numbers algebra folding tube maps cube numbers calculus surds books median triangle numbers crossnumber christmas multiplication shape arrows advent complex numbers remainders 3d shapes clocks range means odd numbers addition scales area ellipses coins factors perfect numbers circles money cryptic clues chalkdust crossnumber sum to infinity chocolate partitions differentiation polygons speed people maths cards fractions doubling grids lines hexagons crosswords multiples star numbers numbers games volume integers gerrymandering averages square roots probability 2d shapes chess probabilty rugby routes angles graphs factorials tiling bases colouring menace square numbers dice ave trigonometry prime numbers number indices digits crossnumbers planes geometry sport wordplay rectangles mean proportion functions floors digital clocks logic palindromes products quadratics dominos

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2020