The River Mathematics

abacus abscissa algebraic angle answer approx axis beads calculate called circle circumference coördinates cosine cube curve decimal point denominator dependent variable derivative digits distance divided draw ellipse equal equation Example expression F₁ factor formula fraction function geometry graph Greek Greenwich ground-speed hairline hyperbola inches indicates Latin latus rectum letter locus logarithms mantissa mark mathematical mathematicians means measurement meridian method multiply Napier's rods number-scale ordinate original parabola parallel parenthesis perpendicular plane point of inflection polygon position quadratic quadratic equations Radians radius reciprocal rectangle represent right triangle righthand rule scale shorthand shown in Figure side sine slide-rule slope speed square root straight line subtract Suppose tangent term tion units in length variable vector velocities weight whole number word write written x-axis y-axis zero