Answer:
1) 93 2) 42 3) 135
Explanation:
Angle CDE is 93 degrees because it's a supplementary angle. A straight line is equal to 180 degrees. So, you'd just do 180-87. This same rule applies for angle DEC where 180-138 is equal to 42. Then to find angle ECD, you'd do 93+42+x=180. Since a triangle is equal to 180 degrees.