The image showing the lines is missing, so i have attached it.
Answer:
m∠BCE = m∠CED = 30° ; Alternate interior angles
Step-by-step explanation:
We are given that:
Line BC and line ED are parallel measure of angle ABC: m∠ABC = 70° measure of angle CED; m∠CED = 30
Looking at the image attached, since line BC and line ED are parallel and transverse line AE intersects both of them, from corresponding angles theorem, we can say that angle BEC will be equal to angle ABC. Thus, BEC = 70°
Angle CED is given as 30°
From principle of alternate interior angles, angle BCE is equal to Angle CED.
Thus,
m∠BCE = m∠CED = 30°