Question

Given : overline BD a diameter m angle 1=100^ m EC = 30 degrees

Answer 1

Angle 1 = 100 degrees

Angle 3 = 30 degrees

---Angle 3 is a central angle because it goes through the center of the circle

Angle 4 = 150 degrees

---Angles 3 and 4 are a linear pair

Angle 2 = 80 degrees

---Angles 1 and 2 are a linear pair

Hope this helps!