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Theorem 3 : Any line parallel to the sides of a trapezium (trapezoid) divides the non-parallel sides proportionally.

Given : ABCD is a trapezoid. DC AB. EF AB and EF DC.

Prove that : AE/ED = BF/FC

Construction : Join AC, meeting EF in G.

StatementsReasons1) EG DC1) Given (in ΔADC)2) AE/ED = AG/GC2) By Basic proportionality theorem3) GF AB3) Given (in ΔABC)4) AG/GC = BF/FC4)By Basic proportionality theorem5) AE/ED = BF/FC5) From (2) and (4)

Source: ask-math.com

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