Question

In Fig., ∠AOC and ∠BOC form a pair of 

(a) vertically opposite angles 

(b) complementary angles 

(c) alternate interior angles 

(d) supplementary angles

Answer 1

(d) Since, ∠AOC and ∠BOC are on the same line AOB and forming linear pair.

∴∠AOC + ∠BOC=180°

Hence, ∠AOC and ∠BOC are supplementary angles.