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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
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2d shapes
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Most recent collections
Advent calendar 2025
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List of all puzzles
Tags
folding tube maps
hexagons
unit fractions
addition
means
dominos
shapes
averages
irreducible numbers
axes
geometry
sum to infinity
angles
number
taxicab geometry
consecutive numbers
dice
parabolas
lists
squares
probability
crossnumbers
rectangles
determinants
cards
ellipses
geometric means
integers
routes
functions
clocks
multiples
coins
perimeter
3d shapes
factorials
square numbers
probabilty
decahedra
gerrymandering
scales
powers
time
calculus
star numbers
floors
chalkdust crossnumber
arrows
expansions
ave
factors
digital products
numbers
elections
consecutive integers
pascal's triangle
chocolate
medians
dates
spheres
money
coordinates
circles
quadrilaterals
square roots
geometric mean
algebra
area
quadratics
binary
triangles
digital clocks
shape
games
palindromes
volume
percentages
indices
multiplaction squares
cube numbers
square grids
differentiation
crosswords
multiplication
triangle numbers
dodecagons
trigonometry
chess
balancing
colouring
polynomials
cryptic crossnumbers
the only crossnumber
prime factors
doubling
mean
median
complex numbers
people maths
tournaments
polygons
proportion
fractions
logic
products
division
sequences
remainders
sums
partitions
xor
wordplay
albgebra
odd numbers
neighbours
symmetry
lines
combinatorics
menace
sport
2d shapes
cryptic clues
regular shapes
cubics
surds
tiling
speed
pentagons
planes
graphs
integration
grids
advent
even numbers
rugby
christmas
tangents
prime numbers
perfect numbers
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