Prove the Extended Angle Addition Property by using the Drawing, the Given, and the Prove that follow.
Given: 

Prove: 

To prove:
The Extended Angle Addition Property.
Given:
It is given that
The given figure is,
Approach:
Angle Addition Property is defined as,
If a point
Calculation:
Use Angle Addition Property for given angle
Use Angle Addition Property for given angle
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