Complementary angles are two angles whose measures add up to 90 degrees. If \( m∠2 = 85° \), you can find \( m∠1 \) using the following equation:
\[ m∠1 + m∠2 = 90° \]
Substituting the value of \( m∠2 \):
\[ m∠1 + 85° = 90° \]
To find \( m∠1 \), subtract 85° from 90°:
\[ m∠1 = 90° - 85° \] \[ m∠1 = 5° \]
So, the value of \( m∠1 \) is \( 5° \).