The statements that are always true regarding the diagrams are mentioned below:
1) m∠5 + m∠3 = m∠1
2) m∠5 + m∠6 = 180°
3) m∠2 + m∠3 = m∠6
4) m∠2 + m∠3 + m∠5= 180°
thus, only one statement i..e m∠3 + m∠4 + m∠5 = 180° does not apply correctly. Rest all statements are valid.