Question

vertical opposite angles defination

Answer 1

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Vertically opposite angles are the angles opposite each other when two lines cross. Vertical means that they share the same vertex.
When the two lines intersect each other it forms two pairs of angles, A+C and B+D. Vertical angles are always congruent means that they are equal.
If angles A measures 100° then angle B will also measure 100° because it is the opposite angle. The two sets of opposite angles measure 360° (a full circle).

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Answer 2

Vertical Opposite Angles=> The angles opposite each other when two lines cross.

➡They are always equal. In this example a° and b° are vertically opposite angles.