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Is the curved surface area of cone RH ???? or is it Rl ??? Consider a hollow cone of radius (R) and height (H)...to find the surface area of the hollow cone consider a small segment dy at a height y from the top and with a radius r as shown in fig, now area of small element dy = 2 r.dy integrating to get area of hollow cone surface area = r=Ry / H (by similarity of triangles) now carrying out the integration we get, surface area of a hollow cone = RH = curved surface area but we know that the curved durface area of a cone is rl ..... so how...... PLZ POST COMMENTS....




Is  the curved surface area of cone RH   ???? or is it  Rl ???







Consider a hollow cone of radius (R) and height (H)...to find the surface area of the hollow cone consider a small segment dy at a height y from the top and with a radius r as shown in fig,




now




area of small element dy  = 2r.dy   




integrating to get area of hollow cone




surface area  =   




r=Ry / H         (by similarity of triangles)




now carrying out the integration




we get,




surface area of a hollow cone = RH = curved surface area




but we know that the curved durface area of a cone is rl .....  so how......




 




PLZ POST COMMENTS....




 




Grade:upto college level

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