Question

What is the measure of this angle?

Answer 1

Answer:

100°

Step-by-step explanation:

∠ACD and ∠ECB are vertical angles and are congruent, thus

∠ECB = ∠ACD = 100°

Answer 2

Answer: m<ECB = 100

It is 100 degrees because they are verticle angles, and verticle angles share the same degree.