The diameter of circle C is 18 cm. Chord AD is the same length as a radius. Does that make angle BDA a right angle?

Question

anonymous · Answer

attachment

anonymous · Answer

I have to solve for  angles BDA and DBA

anonymous · Answer

@amistre64 can you help me?

amistre64 · Answer

what do we know of circle thrms?  any that you think would be useful?

amistre64 · Answer

A is a right angle, not D

amistre64 · Answer

EF is a radius,  but so is CF and CE, would making a triangle CEF help us out?  and what sort of triangle is it?  just some thoughts

amistre64 · Answer

|dw:1433523371575:dw|

not too sure if it helps or not

here_to_help15 · Answer

IS this your question?
1. The diameter of circle C is 18 cm. Chord AD is the same length as a radius. Use this information, the diagram, and your experiences in geometry this semester to answer these questions. (Use π 3.14) 

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 =1/2 BD, then what is the degree measure of arc EF?

anonymous · Answer

Thank you @amistre64 as long as I know it's 90 degrees it makes this whole question lot easier.

anonymous · Answer

@Here_to_Help15 yea it is(I didn't upload that though), I just needed a little help.

here_to_help15 · Answer

Oh here want the explanations for all those?

anonymous · Answer

no, I could do it but thanks though :)