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ar(DOC) = ar(AOB)
addind Ar(BOC to both sides.
we get
Ar (BDC)= Ar(ACB)
BUt they are on same base
This means AD || BC
angle BDA = angle DBC (alt interior angles).
addind Ar(BOC to both sides.
we get
Ar (BDC)= Ar(ACB)
BUt they are on same base
This means AD || BC
angle BDA = angle DBC (alt interior angles).
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