the radius and height of a cone are in the ratio 4:3.tha area of the base is 154cm2.find the area of the curved surface area.

It is a easy question.

We have given the ratio of radius and height i.e 4 : 3


Radius = 4x

Height = 3x

Slant Height = root [(4x)2 +(3x)2 ]=5x {Pythagoreus Theorem}




We know that 

Area of Base = pie X radius

154=22/7 X 16x2



Height =5.25cm

Slant Height =8.75cm 

Curved Surface Area = pie X radius x slant height

                                        =22/7 X 7 X 8.75


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