Manila is 2.4 times larger than Pasay.
Area: 42 km2 calculated
Manila is the capital and second largest city of the Philippines. It is one of the sixteen cities which, along with the municipality of Pateros, make up Metro Manila, the National Capital Region, whose overall population is around 12 million. Wikipedia
Area: 18 km2 calculated
Pasay, officially the City of Pasay, is one of the cities and municipalities that make up Metro Manila in the Philippines. It is bordered on the north by the country's capital, the City of Manila, to the northeast by Makati City, to the east by Taguig City, and Parañaque City to the south. Wikipedia