Answer asap timed quiz — right answer = brainlist given: quadrilateral abcd inscribed in a circle prove: ∠a and ∠c are supplementary, ∠b and ∠d are supplementary (picture attached) let the measure of   = a°. because   and   form a circle, and a circle measures 360°, the measure of   is 360 –  a°. because of the theorem, m∠a =   degrees and m∠c  =    degrees. the sum of the measures of angles a and c is   degrees, which is equal to , or 180°. therefore, angles a and c are supplementary because their measures add up to 180°. angles b and d are supplementary because the sum of the measures of the angles in a quadrilateral is 360°. m∠a +  m∠c +  m∠b +  m∠d =  360°, and using substitution, 180° +  m∠b +  m∠d =  360°, so m∠b +  m∠d  =  180°. what is the missing information in the paragraph proof? inscribed angle polygon interior angle sum quadrilateral angle sum angle bisector mark this and return