Lookat a third pair.
Is it a coincidencethat a sphereand a cylinderwhoseradiusand heightare equalto the radiusof the sphere
havethe exactsamesurfacearea?Not at all! In fact, the ancientGreeksuseda methodthat showedthat
the followingformulacan be usedto find the surfacearea of any sphere(or any cylinderin which ).
The SurfaceAreaof a Sphereis givenby:Example 1
Find the surfacearea of a spherewith a radiusof 14 feet.Use the formula.Example 2
Find the surfacearea of the followingfigurein termsof