Can anyone help me with this geometry problem
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Can anyone help me with this geometry problem

[From: ] [author: ] [Date: 12-03-13] [Hit: ]
C) ADJ = 30 degrees since triangle ADJ is an isocellies angle JAD =90 and chord JD crosses the center of the circle. Also known as the DIAMETER of the circle.D) working on it so far.http://answers.yahoo.com/question/index;_ylt=AsWkOi7GpeBQpRk0HidKiIPsy6IX;_ylv=3?......
ABCDEFGHIJKL is a regular dodecagon. Use the circumcircle (circumscribed circle - circle that surrounds the polygon) to find the following:

a) Angle ABC

b) Angle ACD

c) Angle ADJ

d) The acute angle between AF and BI.

You dont have to solve them, but if you could tell me how to do them i would be grateful.Thanks

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A) ABC = 150 because regular Dodecagon = 150 degrees for each vertex.

B) This needs to be drawn but solvable. you have 3 equations and 4 unknowns

C) ADJ = 30 degrees since triangle ADJ is an isocellies angle JAD =90 and chord JD crosses the center of the circle. Also known as the DIAMETER of the circle.

D) working on it so far. trying to look for similar triangles and properties

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HELP ME

http://answers.yahoo.com/question/index;_ylt=AsWkOi7GpeBQpRk0HidKiIPsy6IX;_ylv=3?qid=20120311194307AAspjPw
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