Answers

2015-02-13T22:07:51+05:30
let a circle with centre O , BO and OD are the radius ( given )
to prove - angle ALO = OMD 
const.  draw a LM which is OL prependicular on AB and OM prependicular CD . 
 PROOF - angle ALO = angle OMD =90degree ( by const. ) 
 therefore , by alternate interior angle AB parallel to CD .

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