What geometry theorem is dynamically being shown in the applet below?[br](Feel free to move the points anywhere you'd like!)
[b][color=#000000]Theorem:[/color][/b][br]The [color=#38761d][b]quadrilateral[/b][/color] formed by connecting the midpoints of the sides of an isosceles trapezoid is a [color=#38761d][b]rhombus.[/b][/color]