Salinon (from the name of an antique greek shield): The area indicated by the yellow color is equal to the area of the circle with diameter BC. (Switch to Ctrl+2 and move A, look at the compound area, computed with the help of the formula).
In the formula, x is the area of circle-quadrant ADEB, y the area of the circle quadrant AFGC and z the area of the circle with diameter DF.
Switch to the pick-move tool (Ctrl+2) catch and move points A, B, C.
![[alogo]](alogo.png){kind=small}
Salinon ![[0_0]](Salinon_files/Salinon_0_0_0.png)
![[0_1]](Salinon_files/Salinon_0_0_1.png)
![[0_2]](Salinon_files/Salinon_0_0_2.png)
![[0_0]](Salinon_files/Salinon_1_0_0.png){kind=small}