Advent calendar 2018

2 December

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

Show answer


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


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


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