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