Opposite ray

Opposite ray:

Two rays $\overrightarrow{PQ} and \overrightarrow{PR}$ are opposite

i) if they are collinear.

ii) $\overrightarrow{PQ} \cap \overrightarrow{PR} = |P|$ i.e

point P is only common point of

( $\overrightarrow{PQ} , \overrightarrow{PR}$ the two rays.

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