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.

A chord separates the circumference of a circle into two sections - the major arc and the minor arc. It also separates the area into two segments - the major segment and the minor segment.

His “sacred arc” theory led him to a discovery termed the Sittaford stone circle in 2007. Building on this idea, he looked for other related Stone Age locations. “I first identified the ...