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.

(i) Obtuse vertically opposite angles means greater than 90° and equal
∠AOD = ∠BOC.
(ii) Adjacent complementary angles means angles have common vertex,
common arm, non-common arms are on either side of common arm and
sum of angles is 90° .
(iii) Equal supplementary angles means sum of angles is 180° and supplement
angles are equal.
(iv) Unequal supplementary angles means sum of angles is 180° and
supplement angles are unequal.
i.e., ∠AOE, ∠EOC; ∠AOD, ∠DOC and ∠AOB, ∠BOC
(v) Adjacent angles that do not form a linear pair mean, angles have common
ray but the angles in a linear pair are not supplementary.
i.e., ∠AOB, ∠AOE; ∠AOE, ∠EOD and ∠EOD, ∠COD

Class 7 Maths Chapter 5 Exercise 5.1

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