Where Pi (π) is of course the number and r is the radius of the circle. Where does this formula come from? One method of obtaining this equation is to integrate dxdy over the area of a circle.

Why is the area of a circle proportional to the square of its radius? And why is that ratio the same as the ratio of the circumference to the diameter?

Learn how to calculate the areas of rectangle, triangle, and circle in Excel for a single cell or range of cells usin this formula.

Circles, sectors and arcs - Edexcel Sector area The circumference of a circle is its outside edge, and is the same distance from the centre at every point along its length.

A portion of the Alligator Alley trail at Circle B Bar Reserve in Lakeland is closed until further notice because of active alligator nesting sites.

Area of a segment A segment is the section between a chord and an arc. It is essentially a sector with the triangle cut out, so we need to use our knowledge of triangles here as well.