The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate the length of the arc, we need to know what fraction of the circle is shown. To do ...

THIS work of Prof. Smith's has a “very practical purpose,” viz, “to present in simple and intelligible form a body of geometric doctrine, acquaintance with which may fairly be demanded of candidates ...

The artists behind increasingly elaborate crop-circle patterns are most likely skilled in math, necessary to plot epic designs, and technologically savvy enough to employ tools like microwave ...