Intersecting Reflections I

Given are two lines intersecting at point

. You can change the lines (and therefore the angle between them) by moving points

and

. Use the scroll bar 'reflect' to perform successively a reflection of Point

with respect to line 1 to

and then reflect

with respect to line 2 to point

. Now use the checkbox to see the measure of angle

. What is the relationship between the angles

and

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