Drag a statement or reason for each box to complete this proof.


Statements Reasons
1. m∠ABD=60°, m∠DBC=40° Given
2. m∠ABD+m∠DBC=m∠ABC
3. Response area Substitution Property of Equality
4. Response area Simplifying
5. ∠ABC is an obtuse angle. Response area
6. △ABC is an obtuse triangle. Definition of an obtuse triangle