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Advent calendar 2015
5 December
All 2015 advent puzzles
~
More information
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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208
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triangles
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2d shapes
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Advent calendar 2025
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List of all puzzles
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geometric means
scales
neighbours
tournaments
taxicab geometry
rectangles
geometric mean
remainders
digits
money
lists
dates
square grids
coordinates
symmetry
perimeter
factors
trigonometry
coins
folding tube maps
3d shapes
number
ave
medians
clocks
surds
chalkdust crossnumber
differentiation
factorials
chess
probabilty
complex numbers
sum to infinity
lines
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tiling
probability
palindromes
indices
axes
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routes
digital clocks
books
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area
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graphs
consecutive numbers
digital products
arrows
functions
speed
floors
bases
logic
proportion
people maths
spheres
range
shape
unit fractions
the only crossnumber
2d shapes
crossnumbers
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colouring
ellipses
time
parabolas
square numbers
chocolate
geometry
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shapes
sets
dominos
addition
rugby
median
prime numbers
odd numbers
elections
circles
binary
cube numbers
crosswords
mean
star numbers
volume
calculus
decahedra
cards
xor
percentages
games
dodecagons
cryptic clues
triangles
pascal's triangle
sport
expansions
cryptic crossnumbers
doubling
multiples
wordplay
even numbers
determinants
quadrilaterals
squares
polygons
regular shapes
albgebra
gerrymandering
perfect numbers
integration
hexagons
planes
triangle numbers
averages
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menace
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integers
numbers
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