Answer :
305 = 35 + 3 * [( 9 * s) / 2] ; where s = the slant height ;
270 = 3 * [( 9 * s) / 2] ;
90 = ( 9 * s ) / 2 ;
180 = 9 * s ;
s = 20 inches.
270 = 3 * [( 9 * s) / 2] ;
90 = ( 9 * s ) / 2 ;
180 = 9 * s ;
s = 20 inches.