Sunday Afternoon Maths XIII

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