In Fig.19, name each linear pair and each pair of vertically opposite angles:

a pair of vertically opposite angles are_____

Pair of vertically opposite angles are ______

In Fig.15, write down: (i) each linear pair (ii) each pair of vertically opposite angles.

In Fig. 15, write down: (i) each linear pair (ii) each pair of vertically opposite angles.

In identity: Two pairs of vertically opposite angles.

Name two pairs of vertically opposite angles in the figure.

Name two pairs of vertically opposite angle in the figure.

In Fig (5.18) identify: (i) Five pairs of adjacent angles.( ii) Three linear pairs.(iii) Two pairs of vertically opposite angles

In Fig (5.18) identify:(i) Five pairs of adjacent angles. (ii) Three linear pairs.(iii) Two pairs of vertically opposite angles

Fill in the blanks: If two lines intersect at a point, and if one pair of vertically opposite angles are acute angles, then the other pair of vertically opposite angles are __________.