Cross an Angle

Can you construct the segment crossing the angle with the given midpoint? [br]Note that the angle and the location of point D are fixed. Given them, you must construct segment EF to have D as its midpoint.[br][br][b]Hint[/b]: This is a challenging problem. Try to add some strategic lines and drag the figure in the activity to see what would help to construct the segment EF at the right place.
Cross an Angle

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