Fill in the blanks to make the statements true.

If the sum of measures of two angles is 180°, then they are _________.

In Fig. 5.32, if PQ||RS and QR||TS, then the value a is

Fill in the blanks to make the statements true.

If sum of measures of two angles is 90°, then the angles are _________.

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A transversal intersects two or more than two lines at _________points.

Fill in the blanks to make the statements true.

If a transversal intersects two parallel lines, then

sum of interior angles on the same side of a transversal is __________.