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