Answers

2014-04-28T08:37:39+05:30
Vertical means they share the same vertex(corner point) not the usual meaning up-down
i have uploaded a file of an example of vertical angles
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2014-04-28T11:58:01+05:30
"Vertical" in this case means they share the same Vertex (corner point), not the usual meaning of up-down.
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