In the Diagram, PA and PB are tangent to circle O at A and B, respectively. Diameter BOD and chord AC intersect at E, mCB=160, and m<APB=40
Find
a.mADCB
b.mAB
c.mCD
d.mDA
e.mDEC
f.mPAC
g.mPBD
h.mPBA
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