ورقة العمل الثانية تحوى جدول تصحيح هذا الحجم عند هذا الارتفاع ولكنها للاسف تتعامل مع الامتار والديسمتر فقط (يعنى خانة عشرية واحدة فقط) مما يضطرك لاستخدام الاستكمال سواء من الداخل او الخارج
فى مثالنا فاننا نبحث عند 17.2 متر =37.895 مترمربع
ولكننا نريد الحجم عند 17.254=37.895+0.54 * (38.336 – 37.895) = 38.1331 مترمربع
linear interpolation between two known points
f the two known points are given by the coordinates \scriptstyle(x_0,y_0) and \scriptstyle(x_1,y_1), the linear interpolant is the straight line between these points. For a value x in the interval \scriptstyle(x_0, x_1), the value y along the straight line is given from the equation
\frac{y - y_0}{y_1 - y_0} = \frac{x - x_0}{x_1 - x_0}
which can be derived geometrically from the figure on the right.
Solving this equation for y, which is the unknown value at x, gives
y = y_0 + (x-x_0)\frac{y_1 - y_0}{x_1-x_0}
which is the formula for linear interpolation in the interval \scriptstyle(x_0,x_1). Outside this interval, the formula is identical to linear extrapolation
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