mscroggs.co.uk
mscroggs.co.uk

subscribe

Puzzles

Archive

Show me a random puzzle
 Most recent collections 

Tags

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

Archive

Show me a random puzzle
▼ show ▼

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

© Matthew Scroggs 2019