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