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Advent calendar 2015

5 December

How many different triangles are there with a perimeter of 100 and each side having an integer length?
(different = not rotations or reflections)

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Advent calendar 2019

Sunday Afternoon Maths LXVII

Coloured weights
Not Roman numerals

Advent calendar 2018

Sunday Afternoon Maths LXVI

Cryptic crossnumber #2

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

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