Let the measure of bcd = aº. because bcd and bad form a circle, and a circle measures 360°, the measure of bad is 360 - aº.
because of the _ _theorem, m za- degrees and m2c = 360 - a degrees. the sum of the measures of angles a
and c is + 360- degrees, which is equal to 360° 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 2a + m2c + m 2b + m2d = 360°, and using substitution, 180° + m 2b + m 2d = 360°, som zb + m 2d = 180°
what is the missing information in the paragraph proof?
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