4. The diameter of circle C is 18 cm. Chord AD is the same length as a radius.

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Use this information, the diagr? a.)What are the measures of angles BDA and DBA?
b.)What is the sine of angle DBA?
c.)Find the length of arc AB to the nearest hundredth.
d.)How does the length of arc AD compare to the length of arc AB?
e.)If EF = BD, then what is the degree measure of arc EF?
 
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