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 each of the following figures, write, if any, (i) each pair of vertically opposite angles, and (ii) each linear pair.

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

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

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

Lines And Angles|Linear Pair Axioms|Theorem (Vertically Opposite 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 are acute angles, then the other pair of vertically opposite angles are __________.

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 ( iv) Adjacent angles that do not form a linear pair

Linear Pair of Angles

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