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Two triangles, DeltaABC" and "DeltaDBC, ...

Two triangles, `DeltaABC" and "DeltaDBC,` lie on the same side of the base BC. From a point P on BC, `PQ||AB" and "PR||BD`are drawn. They intersect AC at Q DC at R. Prove that QR||AD.

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The correct Answer is:
`therefore" seg "QR||" seg "AD`
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