Question: Use a Level 2 or Level 3 proof toverify that the sum of the three interior angles of a triangle equals 180 o . Use

Use a Level 2 or Level 3 proof toverify that the sum of the three interior angles of a triangle equals 180^o. Use the picture below to help construct your argument and the fact that straight angle EAD measures 180^o. Assume no relationships about D, A, & E except that they are collinear.

Given: ED (I BC\f

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