IIT JEE , AIEEE Forum - Mathematics , Analytical Geometry

karthik_abiram

hiiii,

Archimedes, a Greek mathematician, found out that the surface area of a sphere is the same as the curved surface area of a cylinder having the same diameter as the sphere and a height same length as the diameter.

Curved surface area of cylinder = 2prh

= 2pr(2r)

= 4pr²

Thus the surface area of a sphere with radius r = 4 pr²

^{SOURCE:-http://library.thinkquest.org/C0110248/geometry/menareasphere.htm}

^{ALSO,DO SEE MY SECOND ONE BELOW}

^CHEERS!

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