Two vertically opposite angles cannot be:
a) acute
b) obtuse
c) right
d) unequal​

State whether the statements are True or False. Vertically opposite angles are either both acute angles or both obtuse angles.

A right triangle cannot have an obtuse angle.

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 __________.

Classify these triangles as right, acute or obtuse angled triangle.

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