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. [br][color=#ff0000]What do you notice about the sum of the two arcs? [/color][br][br]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:[br]https://www.geogebra.org/m/N8k3CmFd [br][br]Try another applet for explaining the observed property.[br][url=https://ggbm.at/pUu9CcVX]https://ggbm.at/pUu9CcVX[/url]