Arcs

Last modified: 19 March 2025
Fibonacci Arcs

Fibonacci Arcs are represented by a series of concentric semicircles. The semicircles are drawn from a control point and directed toward the common origin. Only the upper or lower semicircles are drawn, depending on the position of the control point in relation to the origin. The distance between the control point and the origin determines the size of the radii of the semicircles, which have a constant ratio to each other. The radii have the ratios: 23.6%, 38.2%, 50%, 61.8%, 78.6%, 100%, 138.2% and 161.8%. To add Fibonacci Arcs to the chart, simply click on the position on the chart where you want to place the common origin of the arcs, hold down the mouse button and move to the point where you want to place the second control point, and finally release the button. After adding Fibonacci Arcs to the chart, you can move or resize them by clicking on the origin point or on the control point and then dragging them to the new position while holding down the left mouse button.