Save guides, add subjects and pick up where you left off with your BBC account. The circumference of a circle = \(\pi d\) or \(2\pi r\). Look at the sector of the circle shown below. To calculate ...

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.

Not to worry; geometry can save you ... Blackburn's formula does this by sketching the arc of your car's turning capability into a full circle, then using the center of the circle to create ...

An alternate idea, using integral calculus is to define π as the arc length of the upper half of the circle x² + y² = 1, the formula for which is (Funny aside: when I generated this equation in ...