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