IM2.7 T9: A special inscribed (?) angle
1. What kind of angle is BDC? 2. Move point D, and describe what happens to angle BDC. Why do you think this is true? 3. What is the relationship between angles BDC and DBE? Why do you think this is true? (Hint: what happens when you slide D close to B?) 4. Summarize what you've learned in your best academic language. What is the relationship between an angle formed by a chord and a tangent, and the arc it opens onto?
Find angles a, b, and c.