# Advent calendar 2018

## Archive

Show me a random puzzle**Most recent collections**

#### Sunday Afternoon Maths LXVII

Coloured weightsNot Roman numerals

#### Advent calendar 2018

#### Sunday Afternoon Maths LXVI

Cryptic crossnumber #2#### Sunday Afternoon Maths LXV

Cryptic crossnumber #1Breaking Chocolate

Square and cube endings

List of all puzzles

## Tags

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

Today's number is the area of the largest dodecagon that it's possible to fit inside a circle with area \(\displaystyle\frac{172\pi}3\).