# Intersecting Reflections I

- Author:
- Esther Gruenhut

- Topic:
- Reflection

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 ?