how can u prove that lateral surface area of sphere is 4πr^2
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It can be proven as CSA or LSA of a hemisphere is 2 pie r sq. so if we join two hemispheres so we will get a sphere and its CSA will be equal to the LSA or CSA of two hemispheres i.e. 2 pie r sq. + 2 pie r sq. equals to 4 pie r sq. (HP)
Happy New Year........
prakhar88:
what is CSA and LSA
and how can we prove it without hemispheres
CSA means curved surface area
LSA means lateral surface area
u can if you know that a sphere has radius in all directions means have four radius and have four circles so area of four circles is 4 pie r square......
for more you can see ncert maths book of class 9th on internet
thank you
welcome
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