Q23 of 113 Page 128

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

When two lines intersect then the vertically opposite angles are always equal.


When a transversal intersects, two other lines, then the sum of two interior angles on the same side of the transversal is 180° if and only if the two lines are parallel. The pair of angles are known as co-interior angles.


So both a is true and b is false.

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