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abacus Alexandrian algebra approximately Archimedes arithmetic arithmetic mean arithmetic series axis base binomial binomial series calculation called celestial celestial pole celestial sphere centimetres centre Chapter circle circle of latitude column connexion corresponding cos2 curve decimal draw earth enclosed equation equivalent Euclid feet figure formula fraction geometric series grammar graph Greek Greenwich height Hindu Hipparchus horizon hypotenuse illustrated inches language large number latitude length logarithms logio longitude mathematicians mean measure meridian method miles moon multiplying noon parallel perpendicular plane pole star polygon position problem quantity radians radius ratio rectangle recurring decimal Reformation geometry represented result right angles right-angled triangle rule shadow sides simple sin2 sine social spherical triangle square root straight line sun's symbols tangent things triangular numbers units verb whole numbers write yards zenith distance