Qingdao (China) is 2.1 times larger than Rizhao (China).
Area: 10,965 km2 calculated
Qingdao is a major city in eastern Shandong Province, Eastern China. Administered at the sub-provincial level, Qingdao has jurisdiction over 7 districts and 5 county-level cities. Wikipedia
Area: 5,340 km2 calculated
Rizhao is a prefecture-level city in southeastern Shandong province, People's Republic of China. It is situated on the coastline along the Yellow Sea, borders Qingdao to the northeast, Weifang to the north, Linyi to the west and southwest, and faces Korea and Japan across the Yellow Sea to the east. Wikipedia