পেট্রোবাংলা প্রিলি ও লিখিত সমন্বিত প্রস্তুতি [Archived]
The volume of a sphere with radius r is (4/3)πr3 and the surface area is 4πr2. If a spherical balloon has a volume of 972π cubic centimeters, what is the surface area of the balloon in square centimeters?