" 8.If two lines intersect,prove that the vertically opposite angles are equal."

Prove that vertically opposite angles are equal.

If two lines intersect; then the vertically opposite angles are equal.

Statements a and b are as given below: a : If two lines intersect, then the vertically opposite angles are equal. b : If a transversal intersects, two other lines, then the sum of two interior angles on the same side of the transversal is 180^(@) . Then

Prove that if two lines intersect each other, then the vertically opposite angles are equal.

If two lines intersect each other, then the vertically opposite angles are equal.

Theorem 6.1 : If two lines intersect each other, then the vertically opposite angles are equal.

If two lines intersect, then vertically opposite angles are......... .

Vertically opposite angles are not always equal.

Fill in the blanks: If two lines intersect at a point, then the vertically opposite angles are always_____________.

Fill in the blanks: If two lines intersect at a point, then the vertically opposite angles are always___________.