[color=#000000]What geometry theorem (or corollary, really) is dynamically being illustrated in the applet below? [br]From which "bigger theorem" does this corollary immediately hold true? [/color]
[color=#000000][b]Corollary: [/b][br]The measure of the exterior angle of any triangle is equal to the sum of its 2 remote interior angles. [br][br][b]Bigger-Picture Theorem (also being illustrated here):[/b][br]Triangle Angle Sum Theorem: The sum of the measures of the 3 interior angles of a triangle is 180 degrees! [/color]