If DBC = 90° what is the relationship between AD and CD?
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Answer
AD=CD
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The sum of supplementary angles is 180º
If ∠ DBC = 90°
∠ DBC = 90° so then ∠ DBA = 90º
DB is the same for the two triangles
and AB = BC
By the side angle side congruence theorem, we can conclude AD=CD
