Forbes contributors publish independent expert analyses and insights. I write about mathematics and its applications The area and perimeter ratios are shown and as n ...

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 ...

To calculate the sector area, first find what fraction of the whole circle we have. Calculate the area of this sector which has a 60° angle to one decimal place. 60° is one sixth of a full turn (360°) ...