 # RS Aggarwal Solutions Class 7 Mathematics Solutions for Lines and Angles Exercise 13 in Chapter 13 - Lines and Angles

Question 3 Lines and Angles Exercise 13

Can two angles be supplementary if both of them are?

(i). Acute?

(ii). Obtuse?

(iii). Right?

(i) No. If two angles are acute, means less than 90^{\circ}, the two angles cannot be supplementary. Because, their sum will be always less than 90^{\circ}.

(ii) No. If two angles are obtuse, means more than 90^{\circ}, the two angles cannot be supplementary. Because, their sum will be always more than 180^{\circ}.

(iii) Yes. If two angles are right, means both measures 90^{\circ}, then two angles can form a supplementary pair.

\therefore 90^{\circ}+90^{\circ}=180

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