Displaying interiorangles in cyclic quadrilateral

[DavidGleaves]

Hi,

I wonder if anyone can advise me.

I\'m trying to use Autograph to show that the sum of the opposite interior angles of a cyclic quadrilateral is 180 degrees but am having problems displaying all the interior angles. Autograph shows two interior (opposite) angles but the other two angles are the exterior angles (lying outside the quadrilateral). I\'d like all the angles displayed to be the interior angles. Any suggestions?

(I\'ve drawn a circle, created four points on the circle and linked them with line segments. I selected two sides and used the "Angle" option on the right-mouse menu to display the angle. I can see an option within "Angle" to select the reflex angle - but not the interior angle.)

Many thanks,

David

[Simon]

Dear David,

Instead of selecting the two sides, select three points, then right-click and choose angle.

Hope that helps,

Simon

[DavidGleaves]

Hi Simon,

Many thanks for this tip. I tried it and it worked.

Kind regards,

David