mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Folding tube maps

Back in 2012, I posted instructions for folding a tetrahedron from tube maps. When tube maps are used, the sides of the tetrahedron are not quite equal. What ratio would the rectangular maps need to be in to give a regular tetrahedron?

Show answer & extension

If you enjoyed this puzzle, check out Sunday Afternoon Maths V,
puzzles about 3d shapes, or a random puzzle.

Archive

Show me a random puzzle
 Most recent collections 

Advent calendar 2024

Advent calendar 2023

Advent calendar 2022

Advent calendar 2021


List of all puzzles

Tags

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

Archive

Show me a random puzzle
▼ show ▼
© Matthew Scroggs 2012–2025