Drag a statement or reason to each box to complete this proof.
Given: the measure of angle A B D equals 60 degrees. The measure of angle D B C equals 40 degrees. Prove: triangle A B C is an obtuse triangle. Art: triangle A B C with horizontal base B C is drawn. A bisector B D is drawn on A C. The bisector divides A C into two parts A D and D C.
1. m∠ABD = 60°, m∠DBC=40° Given
2. m∠ABD + m∠DBC = m∠ABC ________
3. ______ Substitution Property of Equality
4. ______ Simplifying
5. ∠ABC is an obtuse angle. _________
6. △ABC is an obtuse triangle. Definition of obtuse triangle
