tolong jawab pake jalan y kk

< BAC = 48°
< BCA = ( 180° - 100° ) = 80°
< CBA = 180° - 48° - 80° = 52°
< DBC + < CBA = 180°
( 2x - 16° ) + 52° = 180°
2x + 36° = 180°
2x = 180° - 36°
2x = 144°
x = 72° ( D )