Statement
If a side of a triangle is produced, the exterior angle so formed is equal to the sum of the interior opposite angles.

Given:


To prove:

Proof:
…(i) ( Theorem)
From (i) and (ii),

Theorem 4 |
If a side of a triangle is produced, the exterior angle so formed is equal to the sum of the interior opposite angles.




…(i) ( Theorem)
From (i) and (ii),

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