the angles in triangle ABC need to add up to 180 degrees; 180= A+B+C. A is 40, B is 30, so CBA=180-40-30. CBA = 110.
Angle CBD would be 70 degrees since CBA and CBD need to equal 180 degrees. 180-110.
Triangle EBD need to equal 180. Angle DEB would equal 180-70-45= 65
Angle CED would equal 180-65= 115
