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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
,
2d shapes
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Advent calendar 2025
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Tags
menace
sport
sum to infinity
consecutive numbers
powers
chalkdust crossnumber
odd numbers
geometric means
grids
range
averages
square numbers
determinants
scales
numbers
2d shapes
sets
christmas
complex numbers
cubics
coins
probabilty
functions
hexagons
dice
multiples
logic
albgebra
planes
unit fractions
fractions
square roots
pascal's triangle
perimeter
parabolas
cryptic crossnumbers
trigonometry
quadrilaterals
even numbers
dodecagons
speed
the only crossnumber
shape
medians
bases
area
prime numbers
means
games
routes
differentiation
symmetry
cryptic clues
polynomials
time
people maths
circles
money
integration
spheres
cube numbers
tangents
products
volume
squares
lines
dates
expansions
median
floors
probability
colouring
square grids
digital clocks
binary
star numbers
cards
irreducible numbers
proportion
ellipses
geometry
digits
addition
tournaments
prime factors
division
integers
palindromes
axes
indices
consecutive integers
calculus
combinatorics
doubling
balancing
graphs
quadratics
rugby
dominos
decahedra
remainders
crosswords
triangles
taxicab geometry
triangle numbers
3d shapes
matrices
algebra
surds
number
lists
factorials
sequences
factors
rectangles
crossnumbers
xor
geometric mean
books
sums
chocolate
perfect numbers
elections
multiplaction squares
pentagons
shapes
digital products
coordinates
percentages
clocks
mean
neighbours
multiplication
gerrymandering
tiling
chess
arrows
wordplay
advent
angles
folding tube maps
ave
partitions
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regular shapes
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