The diameter of two cones are equal.if their slant height are in the ratio 5:4 the ratio of their curved surface areas is
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D = d L : l = 5:4
:. R = r
C S A (phi) (r) (L)
--------- =---------------
c s a (phi) (r) (l)
= 5
----
4
:. R = r
C S A (phi) (r) (L)
--------- =---------------
c s a (phi) (r) (l)
= 5
----
4
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