If the acute angle between two intersecting lines is $70^{c}irc$, what is the measure of the obtuse angle formed by the same lines?

Step-by-step solution

1. The two lines form two pairs of vertical angles; one acute and one obtuse.
2. The sum of the acute and obtuse angles is $180^{c}irc$.
3. Compute $180^{c}irc-70^{c}irc=110^{c}irc$.
4. Thus the obtuse angle measures $110^{c}irc$.

Concept tested: Vertical angles

Published 10 October 2026 · How this solution was prepared and checked