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