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. Sometimes 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 2020

Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2021