To determine \( m∠4 \), additional information about the relationship between \( m∠2 \) and \( m∠4 \) is needed, such as whether \( m∠4 \) is supplementary, complementary, corresponding, or congruent to \( m∠2 \). Without this context or additional angles, I cannot provide a specific measurement for \( m∠4 \).
Please provide more information or context for the angles, and I would be glad to help!