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