12 and 13 th sum steps
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sum of opposite angles of a cyclic quadrilateral is 180 degree then angle BCD = 180 - 100
= 80
a b parallel to CD and AD is a transversal then angle adc + dab = 180 degree
so 180 - 100 = 80
= 80
a b parallel to CD and AD is a transversal then angle adc + dab = 180 degree
so 180 - 100 = 80
correlations:
third same to first
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