Abcd is a cyclic quadrilateral db=50°db=33° the measures of bcd=
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db=50, and db=33.
then angle a+angleb =180
90+90=180
twice of 90=180
180-90
90÷2=45
then angle a+angleb =180
90+90=180
twice of 90=180
180-90
90÷2=45
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