Bisectors

The sum of the measures of angles 1 and 2 in the figure below is 90°. What is the measure of the angle formed by the bisectors of these two angles?


	CR Pre	8%
	8th	23%
	12th	44%
	CR Post	46%

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This question requires understanding and use of the definition of bisector. Also probably a descriptive/analytic level question, but unlike the perpendicular question it requires analysis.