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Advent calendar 2018
23 December
All 2018 advent puzzles
~
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Today's number is the area of the largest area rectangle with perimeter 46 and whose sides are all integer length.
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The largest rectangle will be 11 by 12 and have area
132
.
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2d shapes
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geometry
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area
,
perimeter
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logic
regular shapes
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consecutive integers
crossnumbers
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routes
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the only crossnumber
ave
remainders
albgebra
polygons
division
digits
sets
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fractions
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determinants
3d shapes
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cryptic clues
powers
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xor
averages
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speed
lists
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numbers
area
pascal's triangle
taxicab geometry
irreducible numbers
polynomials
percentages
tournaments
balancing
square grids
lines
median
square roots
odd numbers
sum to infinity
digital clocks
chocolate
planes
perimeter
scales
symmetry
2d shapes
consecutive numbers
squares
quadratics
digital products
cryptic crossnumbers
factorials
books
floors
coins
partitions
proportion
people maths
trigonometry
triangles
surds
chalkdust crossnumber
crosswords
integration
dice
rectangles
mean
square numbers
shape
binary
wordplay
matrices
geometry
christmas
time
pentagons
ellipses
differentiation
cube numbers
volume
sums
doubling
graphs
shapes
parabolas
decahedra
colouring
geometric mean
chess
calculus
neighbours
addition
spheres
prime factors
gerrymandering
even numbers
tiling
unit fractions
axes
coordinates
cards
grids
algebra
multiplication
perfect numbers
prime numbers
cubics
folding tube maps
arrows
indices
angles
rugby
probabilty
functions
dominos
expansions
number
menace
multiplaction squares
sequences
range
clocks
medians
products
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dodecagons
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