(i) If two angles are complementary, then the sum of their measures is _90°_ .
(ii) If two angles are supplementary, then the sum of their measures is _180°_ .
(iii) Two angles forming a linear pair are _suplimentry_ .
(iv) If two adjacent angles are supplementary, they form a _linear pair_.
(v) If two lines intersect at a point, then the vertically opposite angles are always _equal_ .
(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 _obtuse angle_ .