GEOMETRY, 2008
Given: .
Prove:
Proof:
Given that . Since forms a linear pair, sum of the measures of angles is 180. .
Simillarly forms a linear pair so sum of the measures of angles is 180, . By transitive property, .
Since , . By substitution and subtracton property we get .
By the definition of congruent angles .
, by ASA postulate.
It is proved.
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