Lesson Check Do you know HOW? 1. If mZA = 58, what is myACB? 2. If BC = 8 and DC = 4, what is the A B radius? 3. If AC = 12 and BC = 9, what is the radius? CLesson Check Do you know HOW? Do you UNDERSTAND? In OO, mCD = 50 and CA ~ BD. C 4. Vocabulary Is a radius a chord? Is a diameter a D 1. What is mAB ? How do you know? chord? Explain your answers. 5. Error Analysis What is the error in the diagram? 2. What is true of CA and BD ? Why? P 3. Since CA = BD, what do you know A about the distance of CA and BD B from the center of OO? RLesson Check Do you know HOW? Use the diagram for Exercises 1-3. A 1. Which arc does Z A intercept? P . 2. Which angle intercepts ABC ? C 3. Which angles of quadrilateral D ABCD are supplementary