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10-AngleBisector

This page uses JavaSketchpad. You may drag any of the red points, and the construction will adjust accordingly.

Explanation of the construction: Triangle ADF is congruent to triangle AEF by SSS, so angle DAF is congruent to angle EAF. Note: The circle in steps 2,3 must be the same radius, but this does not have to be the same as the radius in step 1.

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