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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 2024
Advent calendar 2023
Advent calendar 2022
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List of all puzzles
Tags
shapes
complex numbers
money
probabilty
range
albgebra
colouring
books
triangles
time
christmas
pentagons
lines
geometry
sum to infinity
binary
consecutive integers
even numbers
numbers grids
squares
indices
cube numbers
sport
digits
planes
median
sets
tiling
geometric means
games
integers
decahedra
prime numbers
consecutive numbers
matrices
chess
square roots
triangle numbers
volume
number
rectangles
perfect numbers
polynomials
coins
perimeter
neighbours
powers
sums
trigonometry
division
regular shapes
factorials
square grids
functions
chalkdust crossnumber
elections
digital clocks
remainders
odd numbers
partitions
palindromes
numbers
square numbers
factors
polygons
cards
spheres
the only crossnumber
tournaments
crosswords
crossnumbers
averages
tangents
cryptic clues
circles
2d shapes
floors
doubling
balancing
differentiation
ellipses
pascal's triangle
multiples
multiplication
unit fractions
chocolate
speed
symmetry
dates
dice
angles
combinatorics
integration
clocks
probability
menace
sequences
shape
cubics
digital products
irreducible numbers
rugby
gerrymandering
people maths
star numbers
dodecagons
logic
quadrilaterals
axes
wordplay
geometric mean
algebra
parabolas
bases
mean
arrows
products
proportion
determinants
ave
means
3d shapes
dominos
scales
coordinates
medians
folding tube maps
taxicab geometry
expansions
area
cryptic crossnumbers
advent
hexagons
routes
grids
percentages
fractions
addition
graphs
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calculus
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