Circle Equation Small 320×307 Medium 640×613 Large 1024×981 Download TIFF Original 3045×2917 | (407.8 KB) Description To find the equation of a circle whose center is the origin and whose radius is 3 units in length. Keywords circle, circle on coordinate plane, coordinate plane, coordinate plane example, coordinate plane geometry, equation of a circle Galleries Circles Source: William Briggs, G.H. Bryan The Elements of Coordinate Geomentry Part 1. The Equations and Properties of the right line and circle (, : University Correspondence College Press Warehouse, ) 28