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Advent calendar 2015
5 December
All 2015 advent puzzles
~
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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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Most recent collections
Advent calendar 2023
Advent calendar 2022
Advent calendar 2021
Advent calendar 2020
List of all puzzles
Tags
complex numbers
elections
squares
cards
menace
irreducible numbers
ellipses
area
gerrymandering
square numbers
digital clocks
integers
square roots
proportion
products
sport
dice
remainders
circles
folding tube maps
averages
mean
expansions
addition
dates
surds
ave
chess
tiling
perimeter
sequences
percentages
sums
books
hexagons
unit fractions
range
division
angles
geometry
trigonometry
graphs
crossnumbers
rugby
sets
geometric means
routes
sum to infinity
time
lines
symmetry
doubling
algebra
crosswords
palindromes
decahedra
tangents
balancing
parabolas
consecutive numbers
cube numbers
binary
taxicab geometry
probabilty
dodecagons
grids
prime numbers
regular shapes
matrices
games
triangles
albgebra
probability
combinatorics
shape
geometric mean
numbers
bases
cubics
the only crossnumber
means
cryptic clues
scales
consecutive integers
tournaments
pascal's triangle
factors
speed
2d shapes
pentagons
advent
factorials
integration
cryptic crossnumbers
determinants
wordplay
planes
fractions
polynomials
colouring
axes
people maths
money
polygons
odd numbers
logic
rectangles
differentiation
partitions
arrows
number
christmas
triangle numbers
even numbers
3d shapes
star numbers
chocolate
clocks
functions
chalkdust crossnumber
shapes
crossnumber
coins
calculus
median
spheres
digits
multiplication
indices
volume
digital products
dominos
coordinates
quadrilaterals
floors
multiples
quadratics
perfect numbers
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