Atriangle is shown with its exterior angles. the interior angles of the triangle are angles 2, 3, 5. the exterior angle at angle 2 is angle 1. the exterior angle at angle 3 is angle 4. the exterior angle at angle 5 is angle 6.
which is a true statement about the diagram?

m∠5 + m∠6 = m∠1
m∠3 + m∠4 + m∠5 = 180°
m∠1 + m∠2 = 180°
m∠2 + m∠3 = m∠5

i need it to be correct < 3