A hollow sphere has an outside diameter of 25cm and an internal diameter of 15cm. Find its internal and external surface area?

Science & Mathematics by Anonymous 2018-06-01 11:02:27

Social Science

3 answers

Anonymous

The following equation is used to determine the surface area of a sphere. A = 4 * π * r^2 r1 =12.5 cm r2 = 7.5 cm A1= π * 625 This is approximately 1,960 cm^2. A2 = π * 225 This is approximately 707 cm^2.
Anonymous

Ao = PI*do^2 = = PI*25^2 = 625PI cm^2 Ai = PI*di^2 = PI*15^2 = 225PI cm^2 ΔA = PI(625.225) = 400PI cm^2
Anonymous

SA= 1963.5 cm^2 and 706.9 cm^2. https://www.calculatorsoup.com/calculato...