document.write( "Question 274830: In parellelogram ABCD angle B exceeds angle A by 30 what is the measure of angle D? How do you figure this out \n" ); document.write( "
Algebra.Com's Answer #200532 by dabanfield(803) ![]() You can put this solution on YOUR website! If they are on the same side then angles A and B are supplementary (their sum is 180).\r \n" ); document.write( "\n" ); document.write( "So we have:\r \n" ); document.write( "\n" ); document.write( "1.) A + B = 180 and \n" ); document.write( "2.) B = A + 30\r \n" ); document.write( "\n" ); document.write( "Substituting A + 30 for B in equation 1.) gives us:\r \n" ); document.write( "\n" ); document.write( "A + (A + 30) = 180\r \n" ); document.write( "\n" ); document.write( "2*A = 150 \n" ); document.write( "A = 75 \n" ); document.write( "B = 105\r \n" ); document.write( "\n" ); document.write( "If D is opposite A then D = 75 (opposite angles in a parallelogram are equal).\r \n" ); document.write( "\n" ); document.write( "I'm not sure how your parallelogram is labeled. Sorry. \n" ); document.write( " |