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Advent calendar 2022
1 December
All 2022 advent puzzles
~
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One of the vertices of a rectangle is at the point \((9, 0)\). The \(x\)-axis and \(y\)-axis are both lines of symmetry of the rectangle.
What is the area of the rectangle?
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The only way this is possible is if the rectangle is this square:
The area of this square is
162
.
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Advent calendar 2025
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List of all puzzles
Tags
scales
volume
factors
crosswords
shapes
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trigonometry
multiplaction squares
complex numbers
fractions
even numbers
remainders
menace
probability
circles
palindromes
2d shapes
sport
square numbers
wordplay
chess
xor
unit fractions
albgebra
matrices
money
logic
expansions
square roots
triangle numbers
digits
median
floors
addition
surds
polynomials
determinants
prime numbers
proportion
cubics
parabolas
range
chocolate
polygons
mean
coins
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regular shapes
hexagons
christmas
speed
functions
products
numbers
axes
ave
rectangles
folding tube maps
irreducible numbers
geometric means
cube numbers
powers
medians
lists
games
pentagons
dice
cards
cryptic clues
routes
symmetry
planes
cryptic crossnumbers
balancing
neighbours
people maths
quadrilaterals
elections
differentiation
multiples
consecutive numbers
dodecagons
indices
doubling
averages
colouring
means
triangles
pascal's triangle
angles
graphs
integration
spheres
combinatorics
square grids
taxicab geometry
decahedra
tiling
ellipses
digital products
clocks
area
tangents
binary
percentages
books
geometric mean
multiplication
consecutive integers
rugby
coordinates
factorials
star numbers
division
partitions
digital clocks
odd numbers
3d shapes
the only crossnumber
algebra
gerrymandering
calculus
geometry
perfect numbers
perimeter
dominos
dates
tournaments
lines
time
probabilty
sets
crossnumbers
arrows
grids
number
integers
sequences
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