Answer :
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 .
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 .