3. In figure 2.20, if La is congruent to Zb and Zx is congruent to Zy then prove that line l || line n.
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If <a is congruent to <b then
l // m -----( 1 )
If <x is congruent to <y then
m // n -----( 2 )
From ( 1 ) and ( 2 ) , we get
If l// m and m // n then
l//n [ Transitive Property ]
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