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If AXB has a measure of 100, and is its angle bisector, what is the measure of BXY?

If AXB has a measure of 100, and is its angle bisector, what is the measure of BXY-example-1

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since xy is the bisector of AXB so it divides the angle to two equal parts
so AXB=AXY+BXY and we know AxY and BXy are equal. so the amount of each of them is half of AXB that means 50
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