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So lets begin with the ratio,-
let radius=4 x
and height =3 x

i,e.  r/h = 4 x/3 x-----------------------------(2)

(slant height) l=root of (4 x)square+(3 x)square ------------------------------(2)                                                                                            -Pythagoras therom
                                                                                                       {see fig.17 }

area of base=pie r square
154=22/7*(4 x)square
154=22/7*16 x

substitute x:-
radius=7 cm
height= 5.25 cm
slant height= 8.75 cm
CSA of cone= pie*r*l------------------------(3)
                      =192.5 cm

0 0 0
how u obtained the height?
substitute x in 3x
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