WHAT IA THALES THEOREM ?
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If a line is drawn parallel to one side of a triangle intersecting the other two sides in distinct points, then the other two sides are divided in the same ratio.
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Statement
A straight line divides any two sides of a triangle in the same ratio then the line must be parallel to the third
Proof:
Given: In triangle AD/DB=AE/EC
To Prove: DE||BC
Construction: Draw BF||DE
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