- Arthur Lee
Drag P and observe the size of the red arcs. Use the control on the left to change the orientation of the lines or angle between them. What do you notice about the sum of the two arcs? Click the check box to divide the circle into equal parts, which may make it easier to estimate the size of the red arcs.
There is a special case of this property: https://www.geogebra.org/m/N8k3CmFd Try another applet for explaining the observed property. https://ggbm.at/pUu9CcVX