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