mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

14 December

Holly draws a line of connected regular pentagons like this:
She continues the pattern until she has drawn 204 pentagons. The perimeter of each pentagon is 5. What is the perimeter of her line of pentagons?

Show answer

Tags: pentagons

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2025

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2026