mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Ellipses

A piece of string 10cm long is tied to two pins 6cm apart. The string is used to draw an ellipse. The pins are then moved 2cm further apart and a second ellipse is drawn. Which ellipse has the larger area?

Show answer & extension

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

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

Archive

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