Therefore, if the circumference of any circle be multiplied by the decimal .31831, the product will be the diameter. In many ... The piston of the railroad engine Boston is 15 inches diameter: how many square inches does it contain? 176.71.
|Title||:||Builders' Reliable Estimator and Contractors' Guide|
|Author||:||Frederick Thomas Hodgson|
|Publisher||:||Рипол Классик - 1911|