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