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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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determinants
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sets
integration
factorials
coins
folding tube maps
money
rugby
matrices
dodecagons
menace
odd numbers
clocks
differentiation
consecutive numbers
tangents
division
time
cube numbers
means
dates
symmetry
triangle numbers
colouring
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digital products
sums
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chalkdust crossnumber
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star numbers
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numbers
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the only crossnumber
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3d shapes
binary
neighbours
coordinates
doubling
powers
remainders
chocolate
tournaments
balancing
perfect numbers
shapes
proportion
cards
wordplay
surds
shape
arrows
people maths
scales
expansions
addition
decahedra
angles
perimeter
even numbers
probability
factors
sport
grids
integers
mean
axes
complex numbers
hexagons
dominos
median
christmas
probabilty
rectangles
area
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triangles
pentagons
range
floors
indices
percentages
square roots
number
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sum to infinity
graphs
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square numbers
unit fractions
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