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

In Fig.19, name each linear pair and each pair 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

In Fig.18 A , B , C are collinear point and /_D B A=\ /_E B Adot (i) Name two linear pairs (ii) Name two pairs of supplementary angles.

Fill in the blanks:(i) If two angles are complementary, then the sum of their measures is _______.(ii) If two angles are supplementary, then the sum of their measures is ______.(iii) Two angles forming a linear pair are _______________.(iv) If two adjacent angles are supplementary, they form a ___________.(v) If two lines intersect at a point, then the vertically opposite angles are always_____________.(vi) If two lines intersect at a point, and if one pair of vertically opposite angles areacute angles, then the other pair of vertically opposite angles are __________.

Indicate which pairs of angles are:(i) Vertically opposite angles. (ii) Linear pairs.

In the adjoining figure, name the following pairs of angles.(i) Obtuse vertically opposite angles(ii) Adjacent complementary angles(iii) Equal supplementary angles(iv) Unequal supplementary angles(v) Adjacent angles that do not form a linear pair

In the adjoining figure, identify(i) the pairs of corresponding angles.(ii) the pairs of alternate interior angles.(iii) the pairs of interior angles on the sameside of the transversal.(iv) the vertically opposite angles.

If one angle of a linear pair is acute, then the other angle is

Write five pairs of adjacent angles.

In the adjoining figure write. (i) all pairs of parallel lines (ii) all pairs of intersecting lines. (iii) Concurrent lines. (iv) Collinear points.