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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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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
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List of all puzzles
Tags
pascal's triangle
differentiation
factorials
prime numbers
angles
squares
odd numbers
dice
crosswords
graphs
unit fractions
indices
gerrymandering
complex numbers
coins
chocolate
sum to infinity
circles
tiling
tournaments
cubics
polynomials
trigonometry
spheres
tangents
digital clocks
chess
quadrilaterals
rectangles
sums
people maths
surds
square roots
decahedra
calculus
ave
symmetry
triangle numbers
ellipses
multiplication
geometric means
combinatorics
clocks
integration
folding tube maps
floors
averages
star numbers
addition
irreducible numbers
matrices
binary
digital products
hexagons
taxicab geometry
remainders
sets
even numbers
triangles
balancing
speed
palindromes
functions
colouring
products
chalkdust crossnumber
determinants
elections
dodecagons
division
logic
arrows
partitions
3d shapes
rugby
numbers
coordinates
sequences
lines
geometry
integers
percentages
volume
multiples
menace
regular shapes
crossnumber
books
quadratics
scales
shapes
dates
christmas
cryptic clues
crossnumbers
consecutive numbers
number
area
means
sport
wordplay
advent
albgebra
geometric mean
doubling
probability
the only crossnumber
time
perfect numbers
parabolas
bases
consecutive integers
proportion
probabilty
shape
grids
digits
cards
square numbers
algebra
perimeter
pentagons
dominos
fractions
factors
planes
expansions
games
mean
2d shapes
money
median
polygons
cryptic crossnumbers
range
routes
axes
cube numbers
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